css按钮放大缩小动画效果

.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);
    }
  }