body,html{margin:0;padding:0;background:#999}a,a:visited{color:#39f}#app{max-width:800px;margin:40px auto}.step{margin-top:40px;margin-bottom:50px}.content{margin:0 50px 20px}.nav{margin-top:80px;text-align:right}footer{text-align:center;margin-top:20px;color:#555;font-size:12px}