Q:

CSS modifications not apply

I've created a simple web page using HTML and code shows below

#header_1 {
  background-color: red;
}
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
  <meta charset="utf-8" />
  <link href="_css/style.css" rel="stylesheet" />
  <title></title>
</head>
<body>
  <h1 id="header_1">This is My Html</h1>
</body>
</html>

I've double checked that my link to style.css is correct. But this style not apply at least once. I've used google chrome browser.

A:

Sometimes this happens because the browser caches the CSS file. To reload the new version of the CSS file, you have to hard refresh your browser. To do that, press CTRL + F5.

