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CSS3 Keyframes animation doesn't work

I am using css3 to animate sprite from the left to right, using Keyframes animation. Anyone help? How to fix this?

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title></title>
</head>
<style>
#adam{
    background:url(adam.png);
    width: 120px;
    height: 180px;
    animation: walk-east 1.0s steps(8) infinite;
}
@keyframes walk-east {
    from { background-position: 0px; }
    to { background-position: -960px; }
}
</style>
<body>

<div id="adam"></div>


<body>
</html>

https://www.adamkhoury.com/demo/sprite_sheets/adam.png

You are missing the -webkit- prefix.

Browser compatibility table for @keyframes .

 #adam { background: url(https://www.adamkhoury.com/demo/sprite_sheets/adam.png); width: 120px; height: 180px; -webkit-animation: walk-east 1.0s steps(8) infinite; animation: walk-east 1.0s steps(8) infinite; } @-webkit-keyframes walk-east { from { background-position: 0px; } to { background-position: -960px; } } @keyframes walk-east { from { background-position: 0px; } to { background-position: -960px; } } 
 <div id="adam"></div> 

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