.bocado:before {
  content: '';
  height: 0;
  width: 0;
  border-width: 8px 8px 8px 8px;
  border-style: solid;
  border-color: rgba(251, 251, 251, 0) rgba(255, 255, 255, 0) white rgba(255, 255, 255, 0);
  position: absolute;
  top: -16px;
  margin-left: 0px;
  border-top-style: inset;
}