使用外部CSS链接修改h1、h3文本颜色失效，请求技术协助

Hey Rick, let's work through why your blue text styles for h1 and h3 aren't showing up. I've gone through your code, and here are the most common fixes to try:

1. Confirm Your File Structure Matches the CSS Path #

Your HTML links to css/style.css, which expects your project to be organized like this:

your-project/
├── index.html (your main HTML file)
└── css/
    └── style.css

• If your CSS file is directly in the same folder as your HTML (not inside a css subfolder), change the link to <link rel="stylesheet" href="style.css">.
• Check for typos: Folder/filenames are case-sensitive on some systems (e.g., CSS vs css will break the link).
• To debug, open your browser's DevTools (F12), go to the Network tab, and reload the page. If style.css shows a 404 error, the path is definitely wrong.

2. Replace the Deprecated <center> Tag in Your h1 #

The <center> tag is outdated, and while it shouldn't usually block color styles, it's best practice to replace it with CSS. Here's how:

• Update your CSS to add centering directly to the h1:

  h1 {
    color: blue;
    text-align: center; /* Add this line to center the text */
  }
  

• Then simplify your HTML h1 to remove the <center> wrapper:

  <h1>Rick Yang</h1>
  

3. Test for Cache or Specificity Issues #

• Clear browser cache: Browsers sometimes hold onto old CSS files. Do a hard reload with Ctrl + Shift + R (Windows/Linux) or Cmd + Shift + R (Mac) to load the latest version.
• Check for style conflicts: If the above steps don't work, temporarily add !important to your color rules to rule out specificity conflicts (this is a test, not a permanent fix):

  h1 { color: blue !important; }
  h3 { color: blue !important; }
  

  If this makes the color show up, you have a hidden style overriding your rules—but based on your code, this is unlikely.

Start with the file structure check first—it's the most common culprit for external CSS not loading!

内容的提问来源于stack exchange，提问作者Rick