CodePen Embed - qBprbGx

<div></div>

div {
width: 100px;
height: 100px;
background-color: orange;
transition-duration: 3s; 
}
div:active {
width: 300px;
background-color: royalblue;
}

This Pen is owned by JangJinWon on CodePen.

This Pen doesn't use any external CSS resources.

This Pen doesn't use any external JavaScript resources.