how to add a border to a box in css code example
Example 1: border-box css
#example1 {
box-sizing: border-box;
}
Example 2: 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 3: 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