css实现按钮放大缩小动态效果

<button class="btn">点我</button>

.btn {
 animation: scaleDrew 2.5s ease-in-out infinite;
}
@keyframes scaleDrew {
    0% {
      transform: scale(1);
    }
    25% {
      transform: scale(1.05);
    }
    50% {
      transform: scale(1);
    }
    75% {
      transform: scale(1.05);
    }
  }