#wrapper-guide{position:absolute;top:0;width:100%;height:100%;display:flex;flex-direction:column;background-color:white;}#header{text-align:center;font-weight:bold;font-size:18px;padding:10px 8px;}#content,#detail{overflow:auto;padding-top:12px;box-shadow:0 0 5px 0 rgba(228,228,228,0.8);}#back{position:relative;float:left;}#back:before{content:"";position:absolute;left:0;width:10px;height:10px;border:2px solid black;border-width:0 2px 2px 0;transform:rotate(135deg)translate3d(0,-50%,0);}