.tip {
  border: 2px solid #000000;
  background: #303030;
  color: #F0F0F0;
  border-radius: 5px;
  padding: 1em;
  z-index: 99;
}
.tip:after,
.tip:before {
  top: 100%;
  left: 50%;
  border: solid transparent;
  content: " ";
  height: 0;
  width: 0;
  position: absolute;
  pointer-events: none;
}
.tip:before {
  border-color: rgba(240, 240, 240, 0);
  border-top-color: #000000;
  border-width: 12px;
  margin-left: -12px;
}
.tip:after {
  border-color: rgba(0, 0, 0, 0);
  border-top-color: #303030;
  border-width: 10px;
  margin-left: -10px;
}