An example:
The CSS rules for this paragraph look like this:
.box-model-demo
{
background-color: #0000ff;
margin: 30px 10 px 10 px 0;
padding: 50px;
border: 50px dotted #00ff99;
color:#ffffff;
}
The class is applied by wrapping the content in a paragraph tag like this <p class="box-model-demo">
Click a button to check validation.