.container {
  display: inline-block;
  position: relative;
  width: 100px;
  vertical-align: middle;
  overflow: hidden;
  height: 100px;
}

.sprite {
  display: inline-block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100px;
  background-repeat: no-repeat;
  background-size: calc(var(--frames) * 100%);
  animation: sprtieAnim 1s infinite steps(calc(var(--frames) - 1));
}

@keyframes sprtieAnim {
  to {
    background-position: 100% 0;
  }
}