#main{text-align:center;width:100%;height:100vh;display:table}.error{vertical-align:middle;display:table-cell}.error h1{padding-right:12px;font-size:50px;animation:.5s infinite alternate type;display:inline-block}@keyframes type{0%{box-shadow:inset -3px 0 #888}to{box-shadow:inset -3px 0 #0000}}