body{background:linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);background-size:400% 400%;animation:gradient 15s ease infinite;height:100vh;}@keyframes gradient{0%{background-position:0% 50%;}50%{background-position:100% 50%;}100%{background-position:0% 50%;}}