html - How to make section 100% size with margins? -

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i want border pictures , parallax scrolling, added section in body , had content in that. when make section 100% or 100vh , add margin goes outside body.

you need section full height 20px margin. have added fiddle here

and code here

<body style="margin:0;background: red; width:100%;height:100%;">      <section style="position: absolute; display: inline-block; top:0; left:0; bottom:0; width:200px;  margin:20px; background:green;">      </section> </body>

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