#tooltip  {
    text-align: center;
    color: #fff;
    background-color: #a1007b;
    position: absolute;
    z-index: 100;
    padding: 6px 8px;
    border-radius: 8px;
    opacity: 0.5;
  }
 
  #tooltip:after /* triangle decoration */ {
    width: 0;
    height: 0;
    border-left: 10px solid rgba(0, 0, 0, 0);
    border-right: 10px solid rgba(0, 0, 0, 0);
    border-top: 10px solid #a1007b;
    -moz-transform: scale(.9999);
    content: '';
    position: absolute;
    left: 50%;
    bottom: -9px;
    margin-left: -10px;

  }

  #tooltip.top:after {
    border-top-color: transparent;
    border-bottom: 10px solid #a1007b;
    top: -20px;
    bottom: auto;
  }

  #tooltip.left:after
  {
    left: 10px;
    margin: 0;
  }

  #tooltip.right:after
  {
    right: 10px;
    left: auto;
    margin: 0;
  }