bootstrap box model code example
Example 1: html box
<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
</head>
<body>
<style>
.box {
height:5px;
width:5px;
background-color:blue;
padding-top: 30px;
padding-right: 30px;
padding-bottom: 30px;
padding-left: 30px;
color:blue;
border-width: 15px 15px 15px 15px;
border-color: blue;
border-style: solid;
border-radius: 70%
outline-color: blue;
margin-top: 10px;
margin-bottom: 10px;
margin-right: 10px;
margin-left: 10px;
}
</style>
<div class="box">
<h1 style="color:black;position:absolute;font-family:helvetical;font-size:20px;left:20px;bottom:325px;">Your Text</h1>
</div>
</body>
</html>
Example 2: box bootstrap
<div class="card" style="width: 18rem;">
<div class="card-body">
<h5 class="card-title">Card title</h5>
<h6 class="card-subtitle mb-2 text-muted">Card subtitle</h6>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
<a href="#" class="card-link">Card link</a>
<a href="#" class="card-link">Another link</a>
</div>
</div>
Example 3: boostrap model box
<!-- Large modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target=".bd-example-modal-lg">Large modal</button>
<div class="modal fade bd-example-modal-lg" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel" aria-hidden="true">
<div class="modal-dialog modal-lg">
<div class="modal-content">
...
</div>
</div>
</div>
<!-- Small modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target=".bd-example-modal-sm">Small modal</button>
<div class="modal fade bd-example-modal-sm" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
<div class="modal-dialog modal-sm">
<div class="modal-content">
...
</div>
</div>
</div>
Example 4: bootstrap box
<div class="card" style="width: 18rem;">
<div class="card-body">
<h5 class="card-title">Special title treatment</h5>
<p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
<a href="#" class="btn btn-primary">Go somewhere</a>
</div>
</div>
<div class="card text-center" style="width: 18rem;">
<div class="card-body">
<h5 class="card-title">Special title treatment</h5>
<p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
<a href="#" class="btn btn-primary">Go somewhere</a>
</div>
</div>
<div class="card text-right" style="width: 18rem;">
<div class="card-body">
<h5 class="card-title">Special title treatment</h5>
<p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
<a href="#" class="btn btn-primary">Go somewhere</a>
</div>
</div>
Example 5: css box model
MDN (Mozilla Developer Network)
Probably the best place for an in-depth explanation of
web related technologies.
See the link below regarding the CSS BOX MODEL