<div class="tooltip">
  <div class="tooltip--container">
    <div class="tooltip--text animated">
      鼠标移到我身上来（^_^）
    </div>
    <div class="tooltip--tip animated"></div>
  </div>
</div>

<div class="tooltip gradient">
  <div class="tooltip--container">
    <div class="tooltip--text animated">
      鼠标移到我身上来（^_^）
    </div>
    <div class="tooltip--tip animated"></div>
  </div>
</div>

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  min-height: 100vh;
  display: flex;
  background: #eee;
}

.tooltip {
  width: 50vw;
  text-align: center;
  position: relative;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.tooltip--container {
  position: absolute;
  z-index:0;
  left: 50%;
  transform: translateX(-50%);
  cursor: pointer;
}

.tooltip--text:before,
.tooltip--text:after{
  display: block;
  content: "";
  position: absolute;
  z-index: -100;
  width: 50%;
  top: 0;
  bottom: 0;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1);
  transition: transform 200ms ease-out;
}

.tooltip--text:before {
  left: 0;
  border-bottom-right-radius: 1rem;
}

.tooltip--text:after{
  right: 0;
  border-bottom-left-radius: 1rem;
}

.tooltip--text {
  background: #fff;
  padding: 0.75rem 1rem;
  text-align: center;
}

.tooltip--tip {
  position: absolute;
  z-index: -100;
  display: block;
  width: 1rem;
  height: 1rem;
  background: #fff;
  left: 50%;
  bottom: -0.5rem;
  transform: 
    translateX(-50%)
    rotate(45deg);
  box-shadow: 3px 3px 6px rgba(0, 0, 0, 0.1);
  transition: transform 200ms ease-out;
}

.tooltip--source {
  font-size: 2rem;
  line-height: 1.5rem;
  font-style: italic;
}

/* this stuff is just for show — leave it out of production */

.animated,
.animated:before
.animated:after {
  transition: transform 200ms ease-out;

}

.tooltip--container:hover {
  
  .tooltip--text:before{
    transform: translateX(-110%);
  }
  
  .tooltip--text:after{
    transform: translateX(110%);
  }
  
  .tooltip--tip {
    transform: 
      translateY(100%)
      translateX(-50%)
      rotate(45deg);
  }
}


.gradient {
  .tooltip--text {
    background-image: linear-gradient(-180deg, #ffffff 0%, #ffe2b6 100%);
    border-radius: 10rem;
    text-align: center;
    
    &::before,
    &::after {
      box-shadow: 0 8px 10px rgba(255, 0, 0, 0.25);
    }
    
    &::before {
      border-radius: 10rem 0 10rem 10rem;
    }
    
    &::after {
      border-radius: 0 10rem 10rem 10rem;
    }
  }
  
  .tooltip--tip {
    position: absolute;
    transform: translateX(-50%) translateY(-50%) rotate(45deg);
    top: 100%;
    left: 50%;
    box-shadow: 1px 1px 12px 5px rgba(255, 0, 0, 0.25);
    z-index: -1;
    background-image: linear-gradient(-198deg, #ffe2b1 0%, #ffe4b6 100%);
  }
}