*{-webkit-box-sizing:border-box;box-sizing:border-box;padding:0;margin:0}img{width:100%;display:block}.app{width:100%;height:100vh;position:relative;background-image:url(../image/a_bg_2.jpg);background-size:cover;background-position:center;background-repeat:no-repeat}.bg-revert{position:absolute;top:0;left:0;width:100%;height:100%;-webkit-transition:all ease 1s;transition:all ease 1s;opacity:0;background-image:url(../image/a_bg_1.jpg);background-size:cover;background-position:center;background-repeat:no-repeat}.bg-revert_show{opacity:1}.logo{width:16%;position:absolute;top:1%;left:43%}.quest{width:24%;position:absolute;top:16%;left:39%}.button{width:20%;bottom:15%;position:absolute;-webkit-animation:button 1s ease;animation:button 1s ease;-webkit-animation-iteration-count:infinite;animation-iteration-count:infinite}.b1{left:20%}.b2{left:60%}.overlay{display:block;width:50%;height:100%;position:absolute;top:0;left:0}.overlay-right{left:50%}@-webkit-keyframes button{from{-webkit-transform:scale(1);transform:scale(1)}50%{-webkit-transform:scale(1.1);transform:scale(1.1)}to{-webkit-transform:scale(1);transform:scale(1)}}@keyframes button{from{-webkit-transform:scale(1);transform:scale(1)}50%{-webkit-transform:scale(1.1);transform:scale(1.1)}to{-webkit-transform:scale(1);transform:scale(1)}}@-webkit-keyframes notice-in{from{opacity:0;-webkit-transform:translateY(-20%);transform:translateY(-20%)}to{opacity:1;-webkit-transform:translateY(0);transform:translateY(0)}}@keyframes notice-in{from{opacity:0;-webkit-transform:translateY(-20%);transform:translateY(-20%)}to{opacity:1;-webkit-transform:translateY(0);transform:translateY(0)}}