.dandelion {  position: fixed;  width: 80px;  height: 80px;  background: url('dandelion.png') no-repeat center center;  background-size: contain;  animation: dandelion-float 10s ease-in infinite;}.clouds {  position: fixed;  width: 100%;  height: 100%;  background: url('clouds.png') repeat-x center center;  animation: clouds-float 20s linear infinite;}@keyframes dandelion-float {  0% {    transform: translate(0, 0);  }  50% {    transform: translate(0, -50px);  }  100% {    transform: translate(0, 0);  }}@keyframes clouds-float {  0% {    transform: translate(0, 0);  }  100% {    transform: translate(1000px, 0);  }}