<style>
  @keyframes shimmer {
    from {
      transform: translateX(-100%);
    }
    to {
      transform: translateX(100%);
    }
  }

  .shimmer {
    position: absolute;
    inset: 0;
    height: 100%;
    width: 100%;
    background: linear-gradient(
      to right,
      transparent,
      hsl(180deg 100% 90%),
      transparent
    );
    opacity: 0.5;
    animation: shimmer forwards;
  }
</style>

<button class="buyButton">Buy Now</button>