jQuery devreye girerse olur.
<html>
<head>
<meta charset="utf-8">
<style type="text/css"> body{margin: 0; padding:0;} .tumicerik { margin: 0; width: 100%; height: 100%; } .sabitDiv{ height: 5%; width: 100%; position: fixed; background-color: #DCDCEF; } .sonrakiDiv{ width: 100%; }</style>
<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
$(window).on("load resize",function() {
var sabitdivyuk = $(".sabitDiv").outerHeight(true);
$(".sonrakiDiv").css("padding-top",sabitdivyuk+"px");
});
});
</script>
</head>
<body>
<div class="tumicerik">
<div class="sabitDiv">SABİT DİV BÖLÜMÜ</div>
<div style="clear: both;"></div>
<div class="sonrakiDiv">BU KISIM FIXED DIV ALTINDA KALIYOR 123 TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST </div>
</div>
</body>
</html>