/* 
 * tooltip
 */
[tooltip-top], [tooltip-right], [tooltip-bottom], [tooltip-left] {
  position: relative;
}
[tooltip-top]::before, [tooltip-top]::after, [tooltip-right]::before, [tooltip-right]::after, [tooltip-bottom]::before, [tooltip-bottom]::after, [tooltip-left]::before, [tooltip-left]::after {
  visibility: hidden;
  opacity: 0;
  transform: translate3d(0, 0, 0);
  transition: all 0.2s ease 0.05s;
  z-index: 10;
}
[tooltip-top]:hover::before, [tooltip-top]:hover::after, [tooltip-right]:hover::before, [tooltip-right]:hover::after, [tooltip-bottom]:hover::before, [tooltip-bottom]:hover::after, [tooltip-left]:hover::before, [tooltip-left]:hover::after {
  visibility: visible;
  opacity: 1;
}
[tooltip-top]::before, [tooltip-right]::before, [tooltip-bottom]::before, [tooltip-left]::before {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  border: 6px solid transparent;
}
[tooltip-top]::after, [tooltip-right]::after, [tooltip-bottom]::after, [tooltip-left]::after {
  position: absolute;
  background: #333333;
  font-size: 12px;
  font-weight: normal;
  color: white;
  padding: 5px 10px;
  white-space: nowrap;
  border-radius: 4px;
  box-shadow: 0px 0px 3px #000000;
}

[tooltip-top]::before {
  border-top-color: #333333;
  top: 0px;
}

[tooltip-right]::before {
  border-right-color: #333333;
  right: 0;
}

[tooltip-bottom]::before {
  border-bottom-color: #333333;
  bottom: 0;
}

[tooltip-left]::before {
  border-left-color: #333333;
  left: 0;
}

[tooltip-top]::before,
[tooltip-bottom]::before {
  left: calc(50% - 6px);
}

[tooltip-top]::after,
[tooltip-bottom]::after {
  left: 50%;
  transform: translateX(-50%);
}

[tooltip-top]:hover::before {
  transform: translateX(0%) translateY(-10px);
}
[tooltip-top]:hover::after {
  transform: translateX(-50%) translateY(-10px);
}

[tooltip-top]::after {
  content: attr(tooltip-top);
  bottom: 100%;
  margin-bottom: -1px;
}

[tooltip-bottom]:hover::before {
  transform: translateX(0%) translateY(10px);
}
[tooltip-bottom]:hover::after {
  transform: translateX(-50%) translateY(10px);
}

[tooltip-bottom]::after {
  content: attr(tooltip-bottom);
  top: 100%;
  margin-top: -1px;
}

[tooltip-right]::before,
[tooltip-left]::before {
  top: calc(50% - 6px);
}

[tooltip-right]::after,
[tooltip-left]::after {
  top: 50%;
  transform: translateY(-50%);
}

[tooltip-right]:hover::before {
  transform: translateX(10px) translateY(0%);
}
[tooltip-right]:hover::after {
  transform: translateX(10px) translateY(-50%);
}

[tooltip-right]::after {
  content: attr(tooltip-right);
  left: 100%;
  margin-left: -1px;
}

[tooltip-left]:hover::before {
  transform: translateX(-10px) translateY(0%);
}
[tooltip-left]:hover::after {
  transform: translateX(-10px) translateY(-50%);
}

[tooltip-left]::after {
  content: attr(tooltip-left);
  right: 100%;
  margin-right: -1px;
}

/* 示例代码 */
.box {
  height: 200px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
}
.box .center {
  width: 300px;
  display: flex;
  justify-content: space-around;
}
.box button {
  width: 100px;
  background: #3eaf7c;
  border: none;
  padding: 8px 10px;
  border-radius: 4px;
  color: #ffffff;
}