I fastened your code utilizing the examples on developer.mozilla.org. I hope that is the anticipated conduct.
animation-iteration-count: infinite; will make the animation repeat eternally.
animation-name defines the identifier utilized in @keyframes.
No positive why animation-duration is required. I wager you will discover it out.
#block{
width: 20px;
peak: 20px;
background-color: blue;
place: absolute;
prime: 130px;
left: 480px;
animation-duration: 3s;
animation-name: block;
animation-iteration-count: infinite;
}
@keyframes block {
0% {
left: 480px;
}
100% {
left: -40px;
}
}<div id="block"></div>
