:doodle{ @grid: 40x1 / 12em; grid-gap: 5px; } @keyframes slide-in { 0% { transform: translateY(-100%); } 100% { transform: traslateY(0); } } background: @pick(#EFBB35, #dfa612, #FAE042, #EFBB35, #E84279, #dfa612); width:100%; height: @rand(10%, 100%); transition: opacity .2s ease-out; animation: slide-in .25s ease-out; opacity: @pick(0.05, 0.1, 0.2, 0.3, 0.4); :hover{opacity: 1}