#app,body{height:100%}.box,.page-container{width:100%;height:100%}.box{display:-webkit-box;display:-ms-flexbox;display:flex;-ms-flex-wrap:wrap;flex-wrap:wrap;display:-webkit-flex;-webkit-box-pack:center;-ms-flex-pack:center;justify-content:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;background-image:url(../img/luckyDrawMBg.53d02e7a.png);background-size:cover}.box .a{margin-bottom:35%}