css
  . loading  {
    border: 5px solid rgba(0,0,0,.3); /*두깨*/
    animation: spin 2s ease-in-out infinite;
  }

.tooltip  {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: black transparent transparent transparent;
}