.tooltip{
  background: #383838;
  color: #fff;
  padding: 8px 10px;
  font-size: 12px;
  /*font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;*/
  line-height: 18px;
  // white-space: nowrap;
  /*text-shadow: 0 -1px 0 #000;*/
  box-shadow: 4px 4px 8px rgba(0,0,0,.3);
  max-width: 200px;
  // 滚动条不闪动
  position: absolute;
  top: -9999px;
  left: -9999px;
}
.tooltip-arrow{
  width: 0;
  height: 0;
  border-style: solid;
  position: absolute;
  margin: 5px;
}
.tooltip, .tooltip-arrow{
  z-index: 1000000;
  pointer-events: none;
}
.tooltip[x-placement^="bottom"]{
  margin-top: 8px;
  .tooltip-arrow {
    border-width: 0 5px 5px 5px;
    border-color: transparent transparent #383838 transparent;
    top: -5px;
    left: calc(50% - 5px);
    margin-top: 0;
    margin-bottom: 0;
  }
}
.tooltip[x-placement^="top"]{
  margin-bottom: 8px;
  .tooltip-arrow {
    border-width: 5px 5px 0 5px;
    border-color: #383838 transparent transparent transparent;
    bottom: -5px;
    left: calc(50% - 5px);
    margin-top: 0;
    margin-bottom: 0;
  }
}

.tooltip[x-placement^="right"]{
  margin-left: 8px;
  .tooltip-arrow {
    border-width: 5px 5px 5px 0;
    border-color: transparent #383838 transparent transparent;
    left: -5px;
    top: calc(50% - 5px);
    margin-left: 0;
    margin-right: 0;
  }
}

.tooltip[x-placement^="left"]{
  margin-right: 8px;
  .tooltip-arrow {
    border-width: 5px 0 5px 5px;
    border-color: transparent transparent transparent #383838;
    right: -5px;
    top: calc(50% - 5px);
    margin-left: 0;
    margin-right: 0;
  }
}