Css tricks

/* Add an arrow for your tooltip*/
.my-tooltip{
  position: relative;
}
.my-tooltip::before{
  content: "";
  position: absolute;
  border-style: solid;
  border-width: 8px;
  border-color: #f00 transparent transparent transparent;
  /* use top, left, bottom and right to position it where it should be*/
}

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