#container{max-width:500px;margin:30px auto}h1{margin:0}article,p{margin:0 0 20px}article{font-size:14px;color:#777}label{color:#00f;font-size:17px}p label{color:#000;display:inline-block;width:50px;font-size:15px}p{font-size:15px;line-height:30px}input#text{width:100%;box-sizing:border-box;font-size:16px;margin-bottom:10px}input[type=range]{width:200px;height:18px;vertical-align:text-bottom}canvas{box-sizing:border-box;width:100%;border:1px dashed #aaa;cursor:pointer}