本地同目录CSS无法关联HTML，FileZilla上传后样式不生效求助

Hey there, let's work through this CSS not loading issue together—it's totally normal to hit this snag when launching your first site, so no need to worry! Here are the most common fixes to check:

• Double-check file upload and server placement
  First, confirm that app.css is sitting in the exact same folder as your HTML file on the server. Sometimes when using FileZilla, it's easy to accidentally drop files into a subfolder or miss an upload (keep an eye on FileZilla's transfer log for any errors). Also, remember that most servers (especially Linux/Unix ones) are case-sensitive—so App.css is not the same as app.css. Make sure the filename in your HTML matches what's on the server exactly.

• Verify your HTML link tag
  Your CSS link in the HTML <head> should look something like this:

  <link rel="stylesheet" href="app.css">
  

  Check for typos—like mixing up rel with ref, or adding extra slashes to the href path (since it's in the same folder, just the filename is correct). You can test this by right-clicking your live page → "View Page Source", then clicking the app.css link in the source. If it opens a blank page or an error, your path or upload is off. If it opens your CSS, make sure the code matches your local version (sometimes uploads don't overwrite old files).

• Clear your browser cache
  Browsers love caching static files like CSS to load pages faster—this means even if you updated the server file, your browser might still be using the old cached version. Try a hard refresh: press Ctrl+Shift+R (Windows/Linux) or Cmd+Shift+R (Mac) to force the browser to reload all resources. You can also open your browser's dev tools (F12), go to the "Network" tab, check "Disable Cache", then refresh again.

• Check for CSS syntax errors
  A tiny mistake in your CSS (like a missing semicolon, unclosed bracket, or invalid property) can break the entire stylesheet. Run your CSS code through a free online validator to catch any syntax issues and fix them.

• Ensure correct file permissions
  Your server needs to allow browsers to read the app.css file. In FileZilla, right-click the app.css file on the server → "File Permissions", and set it to 644 (owner can read/write, others can read). This is the standard permission for static files and should fix any access issues.

Give these steps a try—one of them almost always fixes the problem!

内容的提问来源于stack exchange，提问作者Stephen HyunGil Kim