body{
            background:#ff0000;
            margin:0;
            padding:0;
        }
        body a {
            position:absolute;
            display:block;
            width:100%;
            height:100%;
            z-index:0;
        }
        .kapsa{
            position:relative;
            margin:0 auto;
            width:1200px;
            height:500px;
            background:#000000;

        }

 
<html>
<head>
    <meta charset="utf-8" />
    <title>asdasd</title>
    
</head>
<body>
    <a href="htt://google.com.tr"></a>
    <div class="kapsa"></div>
</body>
</html>

olay budur