.collapse{width:100%;height:100%;background-color:#5b8ff9;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-pack:center;-ms-flex-pack:center;justify-content:center;-webkit-box-orient:vertical;-webkit-box-direction:normal;-ms-flex-direction:column;flex-direction:column;-webkit-box-align:center;-ms-flex-align:center;align-items:center}.collapse-img{width:80%}.back{cursor:pointer;position:fixed;bottom:10%;color:#fff;font-size:35px;border-bottom:3px solid #fff}