adding css to html body

CSS
Three ways to add CSS to the body of html:
	1)External CSS
	2)Internal CSS
	3)Inline CSS

1) Externally:  
    Type your css code in a file. Remember you file name.
	Then,
<head>
	<link rel="stylesheet" type="text/css" href="FileName.css" >
</head>

2) Internally:
	Type your cSS in the html file itself. (It is not preffered until
	little CSS code is to be added). This can be done by style tag.
	Example:
	<head>
	<style>
	h1 {
      text-color:red;
      text-size: 0.8em;
    }
    </style>
	</head>

3) Inline:
	This method is not used by developers as it is very lengthy and
	maintaining code becomes difficult.
	Example:
   <h1 style="color:blue;text-align:center;">Header file</h1>/*
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.
Namaste
*/<link rel="stylesheet" href="styles.css">  <link rel="stylesheet" href="styles.css">
Source