.flash{top:20px;font-size:30px;opacity:0;-webkit-animation:fadeIn 1s linear infinite;animation:fadeIn 1s linear infinite}.flash,.main-pic{position:relative}.main-pic{width:100%}.main-pic .btn1{top:36%}.main-pic .btn1,.main-pic .btn2{width:7%;height:10%;position:absolute;left:50%;cursor:pointer}.main-pic .btn2{top:58%}.main-pic .btn3{width:7%;height:10%;position:absolute;left:50%;top:79%;cursor:pointer}@-webkit-keyframes fadeIn{0%,to{opacity:0}50%{opacity:1}}@keyframes fadeIn{0%,to{opacity:0}50%{opacity:1}}