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 .cloud { width: 200px; height: 60px; background: #fff; border-radius: 200px; -moz-border-radius: 200px; -webkit-border-radius: 200px; position: relative; } .cloud:before, .cloud:after { content: ''; position: absolute; background: #fff; width: 100px; height: 80px; position: absolute; top: -15px; left: 10px; border-radius: 100px; -moz-border-radius: 100px; -webkit-border-radius: 100px; -webkit-transform: rotate(30deg); transform: rotate(30deg); -moz-transform: rotate(30deg); } .cloud:after { width: 120px; height: 120px; top: -55px; left: auto; right: 15px; }

 .x1 { -webkit-animation: moveclouds 15s linear infinite; -moz-animation: moveclouds 15s linear infinite; -o-animation: moveclouds 15s linear infinite; } .x2 { left: 200px; -webkit-transform: scale(0.6); -moz-transform: scale(0.6); transform: scale(0.6); opacity: 0.6; /*opacity proportional to the size*/ /*Speed will also be proportional to the size and opacity*/ /*More the speed. Less the time in 's' = seconds*/ -webkit-animation: moveclouds 25s linear infinite; -moz-animation: moveclouds 25s linear infinite; -o-animation: moveclouds 25s linear infinite; } ...... @-webkit-keyframes moveclouds { 0% {margin-left: 1000px;} 100% {margin-left: -1000px;} } @-moz-keyframes moveclouds { 0% {margin-left: 1000px;} 100% {margin-left: -1000px;} } @-o-keyframes moveclouds { 0% {margin-left: 1000px;} 100% {margin-left: -1000px;} }