<div class="r"></div>
<div class="g"></div>
<div class="b"></div>
div{
display: inline-block;
width: 100px;
height: 100px;
}
.r{
background-color: red;
}
.g{
background-color: green;
}
.b{
background-color: blue;
}
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.