*{margin:0;padding:0}body{width:100%;overflow-y:scroll;overflow-x:hidden;display:block;position:relative}.cloud{position:absolute;top:-100px;-webkit-animation:50s infinite cloud_1;animation:50s infinite cloud_1;width:800px;z-index:0}.cloud_2,.cloud_3,.cloud_4{position:absolute;width:500px;z-index:0}.cloud_2{top:0;-webkit-animation:60s infinite cloud_2;animation:60s infinite cloud_2}.cloud_3{top:4%;-webkit-animation:30s infinite cloud_2;animation:30s infinite cloud_2}.cloud_4{top:2.5%;-webkit-animation:70s infinite cloud_2;animation:70s infinite cloud_2}@-webkit-keyframes drive{from{-webkit-transform:translateX(-100px);transform:translateX(-100px)}to{-webkit-transform:translateX(1950px);transform:translateX(1950px)}}@keyframes drive{from{-webkit-transform:translateX(-100px);transform:translateX(-100px)}to{-webkit-transform:translateX(1950px);transform:translateX(1950px)}}@-webkit-keyframes drive_2{from{-webkit-transform:translateX(1950px);transform:translateX(1950px)}to{-webkit-transform:translateX(-200px);transform:translateX(-200px)}}@keyframes drive_2{from{-webkit-transform:translateX(1950px);transform:translateX(1950px)}to{-webkit-transform:translateX(-200px);transform:translateX(-200px)}}@-webkit-keyframes cloud_1{from{-webkit-transform:translateX(1900px);transform:translateX(1900px)}to{-webkit-transform:translateX(-900px);transform:translateX(-900px)}}@keyframes cloud_1{from{-webkit-transform:translateX(1900px);transform:translateX(1900px)}to{-webkit-transform:translateX(-900px);transform:translateX(-900px)}}@-webkit-keyframes cloud_2{from{-webkit-transform:translateX(1900px);transform:translateX(1900px)}to{-webkit-transform:translateX(-500px);transform:translateX(-500px)}}@keyframes cloud_2{from{-webkit-transform:translateX(1900px);transform:translateX(1900px)}to{-webkit-transform:translateX(-500px);transform:translateX(-500px)}}