Animate CSS border-bottom property

To implement animation on the border-bottom property with CSS, you can try to run the following code:


Live Demo

<!DOCTYPE html>
         div {
            width: 500px;
            height: 400px;
            background: yellow;
            border: 5px dashed yellow;
            background-image: url('');
            animation: myanim 3s infinite;
            background-position: bottom left;
            background-size: 50px;
         @keyframes myanim {
            20% {
               background-color: maroon;
               background-position: bottom right;
               background-size: 90px;
               border-bottom: 25px solid orange;
      <h2>Performing Animation for bottom border</h2>