you should use “position:relative;” for parent div, test this :
<!DOCTYPE html>
<html style="height:100%; margin:0; padding:0">
<body style="height:100%; margin:0; padding:0">
<div style="position:relative; height:2000px; margin:0; padding:0; background-color:red">
// Background div.
<div style=" position:absolute; top:0; height:100%; width:100%; min-width:100%; background-color:blue">
</div>
// More divs with content on top.
</div>
</body>
</html>
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