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#parent { position: relative; width: 400px; height: 400px; background: red; border: 0 solid black; } #child { position: absolute; left: 300px; top: 200px; right: 20px; bottom: 20px; background: blue; border: 0 solid black; } .floatLeft { width: 50px; height: 10px; background: green; float: left; }