.rules_modal_cont{  height:800rpx;  width:200rpx;  -webkit-animation: showZeroAlert 0.3s;  animation: showZeroAlert 0.3s;}@keyframes showZeroAlert {  0% {    -webkit-transform: scale(0.5);    transform: scale(0.5);  }  45% {    -webkit-transform: scale(1.05);    transform: scale(1.05);  }  80% {    -webkit-transform: scale(0.95);    transform: scale(0.95);  }  100% {    -webkit-transform: scale(1);    transform: scale(1);  }}

动画效果就是先变大再变小，有一个“弹”的动作~