header{padding:0 1em;background:pink}nav{padding:1em 0 0;height:100%;background:#efefef}.button{padding:.25em 1em;color:#00f}.button:hover{border-radius:5px;color:#fff;background:#00f;cursor:pointer}section{display:inline-block;font-size:1em}p{padding:0 1em}main{display:block;position:relative;width:100%;height:100%}.side{display:inline-block;position:relative;width:20%}.items{display:inline-block;position:absolute;width:80%;height:100%;padding:1em 0 0;background:#ff0}