To implement animation on the background-color property with CSS, you can try to run the following code
Example
<!DOCTYPE html>
<html>
<head>
<style>
div {
width: 400px;
height: 300px;
background: yellow;
animation: myanim 3s infinite;
}
@keyframes myanim {
20% {
background-color: maroon;
}
}
</style>
</head>
<body>
<div></div>
</body>
</html>