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<!DOCTYPE html>
<html>
<head>
    <title>كهنة.</title>
    <meta charset="utf-8">
</head>
<body>
<div>
    <img id="yaAll" src="https://sun9-50.userapi.com/c855428/v855428381/fc0d0/MJ9EQyQysMw.jpg">
</div>
</body>
<style>
    html, body {height:100%; width: 100%;}
    body {
        background: url(https://sun9-29.userapi.com/c855428/v855428093/fab7b/p9BPGvgd5-0.jpg);
        margin: 0px;
        display: flex;
        align-items: center;
        align-content: center;
        justify-content: center;
    }
    #yaAll {
        box-shadow: 15px 20px 30px 10px;
        width: 100%;
    }
</style>

</html>