link bootstrap 4.0 code example

Example 1: bootstrap 4

<!-- CSS only -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">

<!-- JS, Popper.js, and jQuery -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script>

Example 2: bootstrap

<svg width="1em" height="1em" viewBox="0 0 16 16" class="bi bi-house-door-fill" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
  <path d="M6.5 10.995V14.5a.5.5 0 0 1-.5.5H2a.5.5 0 0 1-.5-.5v-7a.5.5 0 0 1 .146-.354l6-6a.5.5 0 0 1 .708 0l6 6a.5.5 0 0 1 .146.354v7a.5.5 0 0 1-.5.5h-4a.5.5 0 0 1-.5-.5V11c0-.25-.25-.5-.5-.5H7c-.25 0-.5.25-.5.495z"/>
  <path fill-rule="evenodd" d="M13 2.5V6l-2-2V2.5a.5.5 0 0 1 .5-.5h1a.5.5 0 0 1 .5.5z"/>
</svg>