h1{font-size:1.5em;line-height:2em;margin:0;padding:0;text-align:center}.wrapper{width:1000px;margin-left:auto;margin-right:auto}.footer{margin-top:3em;background:#444;color:#e0e0e0;padding:1em 0;line-height:2em;font-size:0.9em;text-align:center}.footer a{color:#e0e0e0;text-decoration:none}.code{font-family:"courier new";font-size:0.8em}.block{display:block}.inline-block{display:inline-block}img.demo{display:block;max-width:800px;height:auto}div.height-200{height:200px}