:root{box-sizing:border-box}*,*:before,*:after{box-sizing:inherit}html{height:100%}body{height:100%;margin:0}h1{margin-top:0}#app{height:100%;display:flex;flex-direction:column;padding:8px}main{flex-shrink:0;flex-grow:1}footer{padding-bottom:10px}