Why Is My CSS Not Loading After Deploying My Website?

If your website looks correct locally but loses its styling after deployment, the problem is usually not the CSS itself.

The most common causes are an incorrect stylesheet path, missing CSS files in the production build, incorrect asset configuration, browser or CDN caching, or a deployment that is serving the wrong files.

The good news is that you can usually identify the cause quickly by checking whether the CSS file is actually being requested by the live website.

Quick Answer

If CSS is not loading after deployment, check these things first: open the live website and inspect the browser's Network tab, look for CSS files returning errors such as 404, open the CSS file URL directly in the browser, check that your production build actually contains the CSS assets, check whether your framework expects a specific base path, clear browser or CDN cache if the old version is being served, and confirm that the deployment uploaded the complete production output.

If the CSS file returns a 404, focus on paths and deployment output. If the CSS file loads successfully but the page still looks wrong, inspect the CSS response, browser console, generated HTML, and application configuration.

Why CSS Can Work Locally but Fail After Deployment

Your development environment and production environment do not necessarily serve files in the same way. Locally, your development server may automatically handle asset paths, module imports, CSS processing, hot reload, and development routing. After deployment, your production server receives the generated files and must serve them from the correct locations.

A path that works locally can therefore point to the wrong location in production. For example, a stylesheet might be referenced as /assets/style.css, but if the website is actually being served from a subdirectory, that absolute path may point somewhere different from where the CSS file exists.

Check Whether the CSS File Returns 404

This is one of the fastest ways to narrow down the problem. Open your deployed website, right-click and choose the browser's developer tools, open the Network tab, reload the page, and filter the requests by CSS. Look at the stylesheet requests. If you see a stylesheet returning a 404 error, the browser requested a file that the server could not find.

That usually means you should investigate the generated asset path, the deployment directory, the framework's base path, whether the CSS file was included in the production build, and whether the hosting server is serving the correct folder.

Open the CSS File Directly

Copy the URL of the stylesheet request and open it directly in your browser. There are two useful outcomes. If the CSS file opens, the server is successfully serving the stylesheet and the problem may instead involve cached content, CSS syntax, CSS ordering, a different stylesheet overriding the expected rules, framework configuration, or JavaScript-generated classes or styles. If the CSS file returns an error, the problem is more likely related to incorrect paths, missing build files, incorrect deployment output, incorrect base URL, or hosting configuration.

This simple test can save a lot of unnecessary configuration changes.

Check Your Production Build

Do not assume that the files visible in your source project are exactly the files being deployed. Run the project's production build command according to its framework. Depending on the framework, the production directory may be named something different. Inspect the generated output and look for CSS files, JavaScript files, images, fonts, and other static assets. Then compare the generated files with what was actually deployed.

Check Asset Paths

One of the most common deployment problems is a path that behaves differently in development and production. For example, ./styles.css and /styles.css do not necessarily refer to the same location. Relative paths are resolved differently depending on where the current document is located. Frameworks can also rewrite asset paths during the production build.

Do not randomly change paths until the problem is understood. First identify the exact URL the browser is requesting, then determine where the corresponding file actually exists.

Check Your Framework's Base Path

Some applications are deployed at the domain root while others may be deployed under a path. That difference can affect asset URLs. If the generated website expects assets under one path while the hosting server serves them from another, CSS and JavaScript files may fail to load. Check your framework's official documentation for its current production base-path configuration instead of copying configuration from another framework.

Check Whether You Uploaded the Correct Folder

A surprisingly common deployment mistake is uploading the project source directory instead of the generated production output. For frameworks that require a production build, the hosting server generally needs the generated output rather than the development source files. Check the deployment instructions for your framework and make sure the hosting provider is serving the correct output directory.

Check Browser Cache

If you recently fixed the CSS but the website still looks broken, your browser may be displaying cached resources. Try a private or incognito window, a hard refresh, another browser, or another device. If the updated CSS appears elsewhere, caching may be involved.

Do not repeatedly change working deployment configuration if the only problem is stale cached content.

Check CDN or Hosting Cache

Some hosting environments place cached assets between the origin server and the visitor. If your CSS file was recently updated, an older copy may still be served. The exact cache behavior depends on the hosting provider and configuration. If the browser is requesting the correct URL but receives an older stylesheet, inspect the response headers and hosting or CDN cache settings.

Check the Browser Console

Open the browser's Console tab and look for messages related to failed resource loading, content security restrictions, MIME types, mixed content, or JavaScript errors that prevent application initialization. A console error does not always mean the CSS is the root problem, but it can reveal another problem affecting the page.

A Simple CSS Troubleshooting Sequence

Use this order instead of changing everything at once: open the live website, open Developer Tools, open Network, reload the page, find the CSS request, check its HTTP response, open the stylesheet URL directly, compare the requested path with the production build, check the deployment output directory, check framework base-path configuration, check browser or CDN caching, and re-test in a private window. This approach helps you identify the actual failure instead of guessing.

Common Mistakes

Changing DNS

DNS usually has nothing to do with a stylesheet file returning a 404 after the correct website is already loading. Do not change DNS records unless you have identified a DNS problem.

Rebuilding Without Checking the Error

Running the build repeatedly does not tell you why the browser cannot find a stylesheet. Inspect the actual network request first.

Uploading Only HTML

A website may depend on CSS, JavaScript, fonts, and images. Uploading only the HTML file can produce an incomplete website.

Copying Configuration From Another Project

Two frameworks can handle asset paths differently. Use the configuration required by your framework and deployment environment.

When the Website Is Still Unstyled

If you have confirmed that the CSS file exists, the CSS URL is correct, the CSS request succeeds, the deployment contains the correct assets, and the browser is not showing a stale copy, then inspect the actual CSS response and page markup. The issue may no longer be a hosting problem. It could be caused by CSS ordering, selector conflicts, missing generated classes, build configuration, or runtime application behavior.

The important thing is to distinguish a missing stylesheet from a stylesheet that loads but does not produce the expected result.

FAQ