<view class="confirm bubble">確定</view>

.confirm{ width: 325rpx; height: 80rpx; background: #07c160; border-radius: 6rpx; font-size: 30rpx; color: #fff; line-height: 80rpx; text-align: center; }.bubble{  position: relative; overflow: hidden;}.bubble:after{ content: ""; background: #999; position: absolute;  width: 750rpx; height: 750rpx; left: calc(50% - 375rpx); top: calc(50% - 375rpx); opacity: 0; margin: auto; border-radius: 50%; transform: scale(1); transition: all 0.4s ease-in-out;}.bubble:active:after { transform: scale(0); opacity: 1; transition: 0s;}