<!DOCTYPE HTML> <title>Test for z-index relationship to border-radius clipping of overflow</title> <style> #one { position: absolute; z-index: 2; background: blue; top: 50px; left: 50px; width: 100px; height: 100px } #twoouter { position: absolute; border-radius: 15px; overflow: hidden; top: 25px; left: 75px; width: 100px; height: 100px } #twoinner { position: relative; z-index: 1; height: 100px; background: fuchsia } #three { position: absolute; z-index: 0; background: yellow; top: 75px; left: 100px; width: 100px; height: 100px } </style> <div id="one"></div> <div id="twoouter"><div id="twoinner"></div></div> <div id="three"></div>