.onions{margin:0 auto;position:relative;width:75%}.onion1,.onion2{left:0;top:0}.onion2{animation-duration:18s;animation-iteration-count:infinite;animation-name:example;opacity:0;position:absolute}@keyframes example{0%{opacity:0}25%{opacity:1}50%{opacity:1}75%{opacity:0}to{opacity:0}}@media (max-width:900px){.onions{width:100%}}