ease animation in css
<!DOCTYPE html>
<html>
<head>
<style>
div {
width: 100px;
height: 50px;
background: red;
color: white;
font-weight: bold;
position: relative;
animation: mymove 5s infinite;
animation-direction: alternate-reverse;
}
#div1 {animation-timing-function: linear;}
#div2 {animation-timing-function: ease;}
#div3 {animation-timing-function: ease-in;}
#div4 {animation-timing-function: ease-out;}
#div5 {animation-timing-function: ease-in-out;}
@keyframes mymove {
from {left: 0px;}
to {left: 300px;}
}
</style>
</head>
<body>
<p><strong>Note:</strong> The animation-timing-funtion property is not supported in Internet Explorer 9 and earlier versions.</p>
<div id="div1">linear</div>
<div id="div2">ease</div>
<div id="div3">ease-in</div>
<div id="div4">ease-out</div>
<div id="div5">ease-in-out</div>
</body>
</html>