how to import bootstrap in css file code example

Example 1: bootstrap cdn

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">

Example 2: include bootstrap

This is the basic Bootstrap package that you will need to download. CSS is a style sheet language for static information.
<link rel=”stylesheet” href=”https://stackpath.bootstrapcdn.com/
bootstrap/4.4.1/css/bootstrap.min.css” integrity=”sha384-Vkoo8x4CGsO3+Hhxv8T/
Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh” crossorigin=”anonymous”>

Example 3: import bootstrap

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">

 
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

 
<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>