Check out example codes for "link html css". It will help you in understanding the concepts better.

Code Example 1

<head>

       
      <link rel="stylesheet" type="text/css" href="theme.css">

    </head>

Code Example 2

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

Code Example 3

<link rel="stylesheet" type="text/css" href="<?php echo CHEMIN_VUES?>css/style.css">

Code Example 4

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" 
  href="mystyle.css">
</head>
<body>

<h1>This is a heading</h1>

  <p>This is a paragraph.</p>

</body>
</html>

Code Example 5

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

Code Example 6

<head>
      <link rel="stylesheet" type="text/css" href="theme.css"> 
</head>

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