how to add css to html

<!DOCTYPE html>

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


<h1>This is a heading</h1>
<p>This is a paragraph.</p>

</html> /*
Adding css file into html document

<link rel="stylesheet" type="text/css" href="yourstylesheetname.css">  /* add this line into head tag of the file with change in file name. */

I hope it will help you.
*/ <head>

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

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

<h1 style="color:blue;text-align:center;">This 
  is a heading</h1>
<p style="color:red;">This is a paragraph.</p>

</html> <link rel="stylesheet" href="hi.css">