<!DOCTYPE html>
<html>
<head>
<style>
#main {
width: 350px;
height: 100px;
border: 1px solid #c3c3c3;
display: flex;
}
#main div {
flex-grow: 1;
flex-shrink: 1;
flex-basis: 300px;
}
#myBlueDiv {
animation: mymove 5s infinite;
}
@keyframes mymove {
50% {flex-shrink: 8;}
}
</style>
</head>
<body>
<h1>Animation of flex-shrink</h1>
<p>Gradually change the flex-shrink property of the "blue DIV" from 1 to 8, and back to 1:<p>
<div id="main">
<div style="background-color:coral;">Red DIV</div>
<div style="background-color:lightblue;" id="myBlueDiv">Blue DIV</div>
</div>
</body>
</html>