Not all frontend code is created equal. When it comes to CSS development in the USA, there's a huge range of companies doing everything from tight, performance-focused styling to full-blown design systems that work across complex platforms. Whether you're launching a fresh product or cleaning up a legacy layout that’s grown into a spaghetti mess, the right CSS team can make a big difference.

In this article, we’re highlighting some of the top CSS development companies based in the United States. These are teams that know how to balance design precision with technical performance, and they’ve worked on everything from quick MVPs to enterprise-scale builds. Let’s take a look.

1. OSKI Solutions

At OSKI Solutions, we treat CSS development as a practical part of building user-focused, high-performance interfaces. We usually combine it with HTML and JavaScript frameworks like React, Vue, or Angular to create front-end environments that feel clean and responsive. For us, CSS isn’t just about styling - it’s how we manage consistency across layouts, simplify interactions, and support accessibility. Whether we’re working on a custom Umbraco project or a standalone front-end solution, we make sure our CSS integrates smoothly with the wider system architecture.

We’ve used CSS in everything from enterprise dashboards to e-commerce platforms and SaaS products. Most of the time, we’re working with component-based layouts, building styles that scale across screen sizes and devices without breaking. Our developers in the USA rely on modular approaches and preprocessors when needed, but we always stick to code that’s easy to maintain and adjust. If something can be done in a simpler, more effective way, we usually lean into that.

Key Highlights:

• Combines CSS with frameworks like Vue, React, and Angular
• Uses modular and scalable layout structures
• Maintains clean, maintainable styling with minimal overhead
• Applies CSS in full-stack projects including Umbraco and SaaS builds
• Builds for responsiveness and accessibility

Services:

• CSS styling for web and SaaS apps
• UI theming for Umbraco CMS projects
• Responsive layout development
• Front-end styling integration with .NET backends
• Modular CSS for component-based systems
• Cross-platform design consistency and optimization

Contact Information:

• Website: oski.site  
• E-mail: contact@oski.site 
• LinkedIn: www.linkedin.com/company/oski-solutions 
• Address: Estonia, Tallinn, Kaupmehe tn 7-120, 10114
• Phone: +48571282759

2. Intersog

Intersog provides CSS development services as part of its broader frontend and custom software engineering capabilities. Based in Chicago and operating globally, they work with enterprises and mid-sized businesses to support digital product development, with CSS playing a role in both standalone styling tasks and full web interface builds. They combine CSS with technologies like HTML, JavaScript, and frameworks such as React or Angular, depending on the client stack. Their CSS work aims to keep interfaces responsive, maintainable, and aligned with device-specific requirements.

They also offer a team-based model for companies looking to scale quickly, matching clients with pre-vetted developers from their internal and international talent pool. Intersog emphasizes smooth onboarding and project kickoff, often within days, and supports long-term delivery needs across industries like automotive, education, and healthcare. While they work at a fast pace, quality control is built into the process. Their CSS services are bundled into larger frontend efforts, backend integration, and support initiatives when needed.

Key Highlights:

• Based in the USA with global delivery centers
• Focus on responsive, scalable frontend development
• Supports rapid team setup for CSS projects
• Works with enterprise and mid-market businesses
• CSS included in broader software development engagements

Services:

• Custom CSS development
• Responsive UI/UX implementation
• CSS3 and cross-browser compatibility
• Integration with HTML, JavaScript, and frontend frameworks
• Dedicated CSS developers for ongoing product support

Contact Information:

• Website: intersog.com
• Facebook: www.facebook.com/intersognorthamerica
• Twitter: x.com/Intersog
• LinkedIn: www.linkedin.com/company/intersog
• Address: 220 N Green St, 2nd floor Chicago, IL 60607, USA
• Phone: +18334683776

3. HyperBeans

HyperBeans offers HTML and CSS development as part of their frontend services, with a focus on building clean, usable interfaces for both mobile and web platforms. Their team works with HTML5 and CSS to create browser-compatible layouts, scalable stylesheets, and responsive designs that align with brand visuals. The developers at HyperBeans lean on a modular CSS approach that avoids large monolithic files, aiming for better maintainability and easier integration into broader systems. They also bring in JavaScript and frameworks like AngularJS and React to support interactive functionality where needed.

Their process blends basic structure with a more complete UX approach. Whether it's designing for a single-page application or a mobile UI, they handle things like color, typography, and layout using a combination of HTML, CSS, and custom components. They also include interface prototyping, cross-browser compatibility, and multilingual support when required. Beyond just building interfaces, they support the full frontend lifecycle from strategy and testing to ongoing maintenance.

Key Highlights:

• Offers CSS and HTML development for both mobile and web apps
• Uses a modular CSS approach for maintainable styling
• Combines HTML/CSS with AngularJS, JavaScript, and React
• Includes UI prototyping and browser compatibility
• Operates across offices in the USA and India

Services:

• HTML5 and CSS3 development
• Cross-browser UI implementation
• Responsive web design
• Custom mobile and web UI design
• JavaScript and AngularJS frontend integration
• Frontend testing and ongoing support

Contact Information:

• Website: hyperbeans.com
• E-mail: contact@hyperbeans.com
• Facebook: www.facebook.com/HyperBeansInfotechPvtLtd
• Twitter: x.com/BeansHyper
• LinkedIn: www.linkedin.com/company/hyperbeansinc
• Instagram: www.instagram.com/hyperbeans.in
• Address: 12716 SE 74th St. WA, USA 98056
• Phone: +1 (845) 940-5051

4. W3care Technologies

W3care Technologies delivers CSS development as part of their broader custom web and mobile development services. They use CSS alongside HTML5 to shape modern, responsive interfaces for websites and web apps. Their team applies CSS to improve layout, styling, and cross-browser compatibility, focusing on both desktop and mobile responsiveness. They also incorporate CSS modules like Sass, PostCSS, and Bootstrap to manage design elements in a more structured way. Their approach separates visual styling from content, making it easier to update the look of an app without changing its structure.

In addition to writing plain CSS, they work with preprocessors and postprocessors to streamline styling workflows and keep things modular. They cover elements like responsive design, layout grids, font styling, and animations. W3care includes these services in web development projects for industries ranging from eCommerce and real estate to education and healthcare. Their process includes everything from planning and wireframes to frontend coding and deployment, depending on client needs.

Key Highlights:

• Uses CSS3 with Bootstrap, Sass, and PostCSS
• Focus on responsive and mobile-friendly layouts
• Supports custom UI styling for web and mobile apps
• Works across multiple industries and CMS platforms
• Offers frontend development alongside design and QA

Services:

• CSS layout and styling implementation
• Cross-browser CSS integration
• Responsive design using media queries
• Sass and PostCSS preprocessing
• UI transitions and CSS-based animations
• Integration with HTML5 and JavaScript frontend systems

Contact Information:

• Website: www.w3care.com
• E-mail: hello@w3care.com
• Facebook: www.facebook.com/w3care
• Twitter: x.com/w3care
• LinkedIn: www.linkedin.com/company/w3care-technologies
• Instagram: www.instagram.com/w3care
• Address: 4730 University Way NE, Suite 104 PMB 20806 Seattle, WA 98105, USA
• Phone: +91 80943-24555

5. Capsquery

Capsquery provides CSS and HTML5 development as part of its broader web design and frontend service line. They approach CSS development from both a visual and structural angle, working with frameworks like Bootstrap and preprocessors such as Sass and PostCSS. Their team focuses on transforming design assets or concept files into functional and responsive pages, whether it's a full business website or a standalone landing page. They also work with CMS platforms and offer customization support for existing layouts based on specific client needs.

Their design process starts with user research and competitive analysis, followed by wireframes, mockups, and final deployment. Capsquery puts a strong emphasis on coordination during the build phase and encourages feedback loops to refine deliverables. Beyond visual styling, they offer layout systems, media queries, and cross-browser compatibility for both mobile and desktop views. Their developers also participate in ongoing maintenance and client support after launch, ensuring updates and refinements are handled over time.

Key Highlights:

• Works with HTML5, CSS3, Bootstrap, Sass, and PostCSS
• Offers frontend services with flexible working models
• Supports CMS integrations and custom landing pages
• Handles UI/UX wireframing, design, and development
• Provides project support with direct developer access

Services:

• CSS3 and HTML5 development
• Responsive layout implementation
• Custom web and mobile UI styling
• CMS website customization
• Landing page design and development
• Visual asset integration using design tools like Photoshop and Illustrator

Contact Information:

• Website: capsquery.com
• E-mail: info@capsquery.com
• Facebook: www.facebook.com/CapsqueryInc
• Twitter: x.com/capsquery
• LinkedIn: www.linkedin.com/company/capsquery
• Instagram: www.instagram.com/capsquery
• Address: 10685-B Hazelhurst Dr.#40956 Houston, TX 77043 USA
• Phone:  (+1) 7133478380

6. Ivory Web Services

Ivory Web Services builds websites that look good and work well across all devices. They mix HTML and CSS into their broader web design work, making sure every site is mobile-friendly, responsive, and on-brand. From the planning phase to final deployment, they cover everything. Their CSS work isn’t just about appearances - it helps keep layouts clean, load times quick, and designs consistent across pages.

They work with businesses in areas like eCommerce, real estate, education, and media. Their team sticks to clean code, using CSS to control layout and visual flow without cluttering things with plugins. They also include things like cross-browser compatibility, voice search support, and PWA features. SEO is baked into most projects, and if clients need ongoing help, they provide that too.

Key Highlights:

• Offers responsive CSS layouts across industries
• Supports cross-browser and device compatibility
• Uses HTML5 and CSS3 for clean, consistent code
• Focuses on fast load times and mobile-first design
• Includes structured development and QA workflow

Services:

• HTML/CSS website development
• Frontend coding for custom web designs
• Mobile-friendly and responsive styling
• CSS-based layout control and optimization
• Web app design with HTML5 and CSS3
• SEO-friendly markup and styling structure

Contact Information:

• Website: www.ivorywebservices.com
• E-mail: info@ivorywebservices.com
• Facebook: www.facebook.com/people/Ivorywebservices/61567323440775
• Twitter: x.com/ivorywebservice
• LinkedIn: www.linkedin.com/in/ivory-web-services
• Phone: (786)305-4993

7. Ezapp Solution

Ezapp Solution helps businesses build clean, fast web interfaces using HTML and CSS. They focus on modular CSS, so layouts adapt easily across different screens. If a project needs flexibility or room to grow, they often use tools like Bootstrap and modern JavaScript frameworks alongside their CSS and HTML work.

They work as a remote development partner, giving clients options to bring in developers short-term or for full-time roles. Their team includes bootcamp-trained engineers, and they use tools like JIRA and Slack to stay in sync. Whether you're launching something new or optimizing an existing interface, they aim for clean code and smooth handoffs.

Key Highlights:

• Provides HTML/CSS development through remote engineering teams
• Focus on modular, responsive CSS styling and clean HTML structure
• Offers flexible hiring models with quick team onboarding
• Supports frontend development with frameworks like Bootstrap
• Maintains developer training programs and delivery team backup

Services:

• HTML and CSS frontend development
• Responsive layout and cross-browser compatibility
• UI/UX styling and code optimization
• HTML platform migration and custom builds
• Project-based or full-time remote developer hiring
• Ongoing maintenance and support for released projects

Contact Information:

• Website: ezappsolution.us
• E-mail: support@ezappsolution.us
• Facebook: www.facebook.com/people/Ezapp-Solution/100076318163577
• Twitter: x.com/SolutionEzapp
• LinkedIn: www.linkedin.com/company/ezapp-solutions
• Address: 460 Park Av, New York City, New York
• Phone: (+1)551-697-9989

8. Codeflash Infotech

Codeflash Infotech focuses on frontend development with HTML5 and CSS, crafting user interfaces that work across all browsers and devices. Their CSS approach is modular and reusable, which helps keep things easy to manage long term. Accessibility and mobile-first thinking are built into their process.

They also handle stuff like PSD to HTML conversions and platform migrations. Whether you're a startup or an established company, they offer flexible team setups and handle testing and deployment as part of their workflow. Their main goal is to make sure interfaces look sharp and load fast.

Key Highlights:

• Offers custom frontend builds using HTML5 and CSS3
• Provides responsive layouts optimized for mobile and desktop
• Supports modular styling and reusable code practices
• Delivers migration and conversion services (e.g., PSD to HTML)
• Works with startups and enterprises using flexible hiring models

Services:

• HTML5 and CSS3 frontend development
• Responsive web design and layout structuring
• Website migration to HTML5
• PSD to HTML/CSS conversion
• Manual and automated quality assurance
• Ongoing support and performance optimization

Contact Information:

• Website: codeflashinfotech.com
• E-mail: contact@codeflashinfotech.com
• Facebook: www.facebook.com/Codeflash-Infotech-111107201027539
• Twitter: x.com/Codeflash_
• LinkedIn: www.linkedin.com/company/codeflash-infotech
• Instagram: www.instagram.com/codeflash_infotech
• Address: 601 S Main St, Ann Arbor, MI 48104, USA
• Phone: (+91) 87802 99105

9. TechInfini

TechInfini TechInfini builds responsive frontends with HTML and CSS, with an extra focus on accessibility and clean structure. They use semantic markup to help with SEO and screen readers, and their CSS setup is modular to make future changes easier. If you have an old site that needs some cleanup or better performance, they can help with that too.

Their frontend work is often tied into bigger builds that include JavaScript and UI/UX design. They follow common CSS best practices like BEM and SMACSS to keep everything scalable. And once a project goes live, they stick around for maintenance and support.

Key Highlights:

• Delivers HTML/CSS frontend development with focus on modularity
• Follows best practices for SEO, accessibility, and responsiveness
• Offers consulting and code optimization for existing builds
• Combines CSS with UI/UX and JavaScript for full interface development
• Provides support and maintenance to ensure ongoing performance

Services:

• Custom HTML/CSS development
• Responsive layout implementation
• UI/UX design and styling
• Code optimization and maintainability consulting
• Accessibility-focused frontend builds
• Ongoing updates and cross-browser support

Contact Information:

• Website: techinfini.in
• E-mail: sales@techinfini.com
• Facebook: www.facebook.com/techinfini
• Twitter: x.com/techinfini
• LinkedIn: www.linkedin.com/company/techinfini-solutions-pvt.-ltd.
• Instagram: www.instagram.com/techinfini
• Address: 510 NW 84th Ave, Plantation, FL 33324, USA
• Phone: +91 7999344717

10. CodeChaps

CodeChaps gives businesses a flexible way to bring on HTML/CSS developers, whether it's for a quick project or long-term work. Their devs are familiar with frameworks like Bootstrap, Tailwind, and Semantic UI, and they also work with frontend libraries like React, Angular, and Vue.

Their workflow covers everything from wireframing in Figma to writing code in VS Code. They use tools like JIRA, Slack, and GitHub to keep projects moving. They've worked with clients in fintech, healthcare, ecommerce, and more, and they also offer staffing and IT support if teams need to scale up fast.

Key Highlights:

• Offers remote HTML/CSS developers with flexible hiring options
• Uses modern frameworks like Bootstrap, Tailwind CSS, and Semantic UI
• Project workflows include standard tools like GitHub, Trello, and JIRA
• Cross-browser compatibility and responsive design are core priorities
• Supports clients in sectors such as healthcare, travel, finance, and ecommerce

Services:

• Custom HTML/CSS web development
• UI/UX implementation and optimization
• Cross-platform responsive design
• Frontend integration with React, Angular, and Vue.js
• HTML/CSS consulting and support
• Dedicated developer hiring and IT staffing models

Contact Information:

• Website: codechaps.com
• E-mail: Sales@codechaps.com
• Twitter: x.com/CodeChaps
• LinkedIn: www.linkedin.com/company/codechaps
• Instagram: www.instagram.com/codechaps
• Address: CC Ave, Malver, PA , R35345, USA
• Phone: +1 - 453-453-4653

11. Glasier Inc.

Glasier Inc. mixes frontend engineering into their larger stack of enterprise and AI services. Their HTML and CSS work helps companies build clean, responsive websites that work well across devices. They focus on reusable code, and they pay close attention to accessibility and consistent design.

They also offer services like PSD to HTML conversion, eCommerce themes, and legacy site migration. Their team is set up for both short-term tasks and longer engagements, and they can include multimedia features when needed. Most projects are backed by technical support and strategic planning.

Key Highlights:

• Focus on reusable and scalable HTML5/CSS3 code
• Support for multimedia features and SEO-friendly structure
• Offers dynamic websites, theme customization, and legacy migration
• Engagement models for both short-term and long-term work
• Responsive support across global time zones

Services:

• Responsive HTML/CSS website development
• PSD to HTML and CSS conversion
• Dynamic website development and upgrades
• Website migration from static to modern layouts
• eCommerce theme creation
• Audio and video integration using CSS features

Contact Information:

• Website: www.glasierinc.com
• Facebook: www.facebook.com/GlasierInc
• Twitter: x.com/GlasierInc
• LinkedIn: www.linkedin.com/company/glasierinc
• Instagram: www.instagram.com/glasierinc
• Address: 1201 North Market Street, Suite 111, Wilmington, DE 19801
• Phone: +1-213-438-9696

12. Codiant

Codiant sees CSS as a key part of their web and mobile projects. They use HTML5 and CSS to build interfaces that work across different devices, often mixing in frameworks and preprocessors to get the styling right. They also handle things like branding, layout tweaks, and PSD conversion.

Their services go a bit deeper too. They develop custom widgets, help migrate apps, and integrate CSS with backend systems when needed. From early planning to post-launch updates, they stay involved to keep things running smoothly.

Key Highlights:

• Uses CSS for responsive design and performance
• Offers consultation and support for CSS code optimization
• Converts PSDs to clean, responsive HTML/CSS templates
• Applies CSS preprocessing for better maintainability
• Integrates CSS with custom widgets, plugins, and web apps

Services:

• Responsive HTML/CSS development
• Custom styling and layout structure
• PSD to HTML5/CSS conversions
• Web app and mobile interface styling
• Data migration and performance optimization
• Widget and plugin development using CSS frameworks

Contact Information:

• Website: codiant.com
• E-mail: info@codiant.com
• Facebook: www.facebook.com/Codiant
• Twitter: x.com/CODIANTSoftware
• LinkedIn: www.linkedin.com/company/codiant-a-yash-technologies-company
• Instagram: www.instagram.com/codiant
• Address: 455 Avenue of the Cities, East Moline, IL - 61244
• Phone: +1-872-444-3361 

13. 9series

9series brings CSS into their product development work to build consistent, responsive interfaces. They use CSS3 to handle layout and styling across devices, making sure the content looks good no matter the screen size. Their team usually works within broader engineering workflows that include AI, cloud tools, or modernizing older systems.

They've worked with companies in healthcare, education, logistics, and more. They also help convert wireframes into CSS, build modular layout systems, and support both static and dynamic content. CSS helps them keep things quick, usable, and flexible.

Key Highlights:

• CSS3 used for interface consistency and responsive layouts
• Combines CSS with modern digital product engineering workflows
• Works across education, healthcare, logistics, and research industries
• Capable of migrating or modernizing older front-end styles
• Incorporates CSS into agile and AI-supported development processes

Services:

• CSS3-based responsive web development
• Front-end layout structuring and visual formatting
• UI styling for mobile and web applications
• Integration of CSS into cross-platform product builds
• Conversion of design assets into modular CSS frameworks
• CSS optimization for page speed and maintainability

Contact Information:

• Website: www.9series.com
• E-mail: sales@9series.com
• Facebook: www.facebook.com/9seriessoftwares
• Twitter: x.com/9series
• LinkedIn: www.linkedin.com/company/9series-solutions-pvt-ltd
• Address: 221 1st Ave W Suite 241 Seattle, WA 98119, USA
• Phone: +1 (425) 504 6109

14. Nextwebi

Nextwebi uses HTML and CSS to build frontends that are clean, accessible, and easy to work with. Whether it's for a static site or a more dynamic app, they aim for structure and speed. Their work often involves component-based UI, semantic HTML, and CSS that adapts across platforms.

They've built interfaces for industries like real estate, hospitality, and education. Their team also handles widget styling, portal design, and testing to make sure things stay consistent across devices. For companies that need extra help, they offer both project work and dedicated developer hiring.

Key Highlights:

• Combines CSS with HTML and component frameworks for scalable UI
• Focuses on accessibility, modularity, and visual consistency
• Provides widget-level custom styling for advanced web components
• Includes responsive design testing and optimization
• Offers flexible hiring models for ongoing or one-off CSS projects

Services:

• HTML/CSS-based front-end development
• Widget and component styling
• Responsive application design
• Cross-platform and browser compatibility
• Custom CSS framework integration
• Ongoing support and layout maintenance

Contact Information:

• Website: www.nextwebi.com
• E-mail: projects@nextwebi.com
• Facebook: www.facebook.com/nextwebi
• Twitter: x.com/nextwebi_
• LinkedIn: www.linkedin.com/company/nextwebi
• Instagram: www.instagram.com/nextwebi
• Address: 188 Spear st #350, San Francisco, CA 94105 United States
• Phone: +91 76196 35111

Conclusion

CSS development isn’t just about making things look nice anymore. It’s become a middle layer between design and functionality - the part that makes everything feel smooth, accessible, and consistent. Whether it's a SaaS platform, a mobile app, or a massive enterprise dashboard, CSS is doing more of the heavy lifting than most people realize.

And looking across all these companies, it's clear they're not treating CSS as an afterthought. It's baked into the workflow. Some lean into frameworks and preprocessors, others keep it lightweight. But in every case, the goal is to build frontends that not only work - they work well for actual people.