*{-webkit-box-sizing:border-box;box-sizing:border-box;padding:0;margin:0}body,html{width:100%}.app{position:relative;width:100%;height:100vh;overflow:hidden;background:#000}video{width:100%}.overlay{position:absolute;top:0;left:0;width:100%;height:100%}.button{position:absolute;width:22%;top:32%;left:39%;-webkit-animation:btn 1s linear;animation:btn 1s linear;-webkit-animation-iteration-count:infinite;animation-iteration-count:infinite}.button .block-rel{width:100%;height:100%;position:relative}.button .block-rel img{width:100%;-webkit-transition:all ease .5s;transition:all ease .5s}.button .block-rel img:first-child{opacity:1}.button .block-rel img:last-child{position:absolute;top:0;left:0;opacity:1}.button:hover .block-rel img:last-child{opacity:0}@-webkit-keyframes btn{from{-webkit-transform:scale(1,1);transform:scale(1,1)}50%{-webkit-transform:scale(1.1,1.1);transform:scale(1.1,1.1)}to{-webkit-transform:scale(1,1);transform:scale(1,1)}}@keyframes btn{from{-webkit-transform:scale(1,1);transform:scale(1,1)}50%{-webkit-transform:scale(1.1,1.1);transform:scale(1.1,1.1)}to{-webkit-transform:scale(1,1);transform:scale(1,1)}}@-webkit-keyframes btn-image{from{opacity:0}50%{opacity:1}to{opacity:0}}@keyframes btn-image{from{opacity:0}50%{opacity:1}to{opacity:0}}