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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 120px; background-color: coral; color: white; animation: mymove 5s infinite; } @keyframes mymove { 50% {width: 500px;} } </style> </head> <body> <h1>Animation of width</h1> <p>Gradually change the width of the DIV element from 120px to 500px, and back to 120px:<p> <div id="myDIV"> <h1>My DIV</h1> </div> </body> </html>