@keyframes curtaina{ 0%,20%,80%,100%{background-size:100% 12000%,100% 12000%;} 40%,60%{background-size:100% 2000%,100% 2000%;} 0%,30%{background-position:0% 51%,0% 51%;} 70%,100%{background-position:0% 0%,0% 0%;} } .curtain{ position:relat…