div.outer { background: yellow; width: 500px; padding: 40px 0; }
div.inner { background: aqua; margin: 20px 0; padding: 20px 0; height: 200px; }
div.fl, div.fr { border: #f0f medium solid; }
div.fl { float: left;  background: #f9f url(float-left.png) top left; }
div.fr { float: right; background: #f9f url(float-right.png) top right; }