<head>
<link rel="stylesheet" href="styles.css">
</head>
<link rel=“stylesheet” type=“text/css” href=“style.css” />
<head>
<!-- Linking external Css document -->
<link rel="stylesheet" href="styles.css">
<!-- Writing Css inside HTML element -->
<style>
...
</style>
</head>
<link rel="stylesheet" href="styles.css">
/*
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
*/
<!DOCTYPE html>
<html lang="en">
<head>
<title>Title</title>
<link rel="stylesheet" type="text/css" href="path of your file" />
</head>
</html>
<head>
<link rel="stylesheet" href="../css.style">
</head>
<head>
<link rel="stylesheet" href="[name of css file]"
</head>
<link rel="stylesheet" href="path/filename.css">