*{margin:0;padding:0}section.air-container{position:absolute;width:100%;height:100vh;background:#4e54c8;overflow:hidden;z-index:-1000}section .air{position:absolute;bottom:0;left:0;width:100%;height:100px;background:url(https://1.bp.blogspot.com/-xQUc-TovqDk/XdxogmMqIRI/AAAAAAAACvI/AizpnE509UMGBcTiLJ58BC6iViPYGYQfQCLcBGAsYHQ/s1600/wave.png);background-size:1000px 100px}section .air.air1{animation:wave 30s linear infinite;z-index:1000;opacity:1;animation-delay:0s;bottom:0}section .air.air2{animation:wave2 15s linear infinite;z-index:999;opacity:.5;animation-delay:-5s;bottom:10px}section .air.air3{animation:wave 30s linear infinite;z-index:998;opacity:.2;animation-delay:-2s;bottom:15px}section .air.air4{animation:wave2 5s linear infinite;z-index:997;opacity:.7;animation-delay:-5s;bottom:20px}@keyframes wave{0%{background-position-x:0px}to{background-position-x:1000px}}@keyframes wave2{0%{background-position-x:0px}to{background-position-x:-1000px}}