效果图

html样式

  <image catchtap="eduBulletFrame" class='in-image'   src="../../images/other/tianjia.png"></image>

  <view class="bubble_frame"    bindtap='uploadVideo'>上传视频作品</view>

css

.in-image{
    width: 35px;
    height: 35px;
    display:flex;/*flex布局*/
    justify-content: center;/*水平轴线居中*/
    align-items:center;/*垂直居中*/
    position: absolute; 
    left:371rpx;
    top: 315rpx;

}
 
.bubble_frame {
  font-size: 26rpx;
  max-width: 252rpx;
  color: #333333;
  padding: 20rpx 40rpx;
  background: #ffffff;
  position: absolute;
  top: 400rpx;
  left:330rpx;
  border-radius: 12rpx;
  z-index: 10;
  box-shadow:2rpx 2rpx 8rpx 8rpx #E4E4E4;
 
}
.bubble_frame:before{
  position: absolute;
  top: -10rpx;
  left: 66rpx;
  content: '';
  width: 20rpx;
  height: 20rpx;
  background: #ffffff;
  transform: rotate(135deg);
  box-shadow:0rpx 0rpx 8rpx 8rpx #E4E4E4;
}
.bubble_frame:after{
  position: absolute;
  top: 1rpx;
  left: 40rpx;
  content: '';
  width: 66rpx;
  height: 16rpx;
  background: #fff;
}
.bubble_frame:hover{
    animation-delay: 0s;
   animation-name: shock;
   animation-duration: .1s;
   animation-iteration-count: 3;
   animation-direction: normal;
   animation-timing-function: linear;
}

原文地址：http://www.cnblogs.com/rzkwz/p/16826449.html