li[tooltip] {
  position: relative;
  overflow: visible;
}

li[tooltip]::before,
li[tooltip]::after {
  position: absolute;
  display: none;
  opacity: 0;
  pointer-events: none;
  z-index: 99999;
}

li[tooltip]::before {
  content: "";
  border: 5px solid transparent;
  border-top-color: #00453d;
  bottom: calc(100% - 15px);
  left: 50%;
  transform: translateX(-50%);
}

li[tooltip]::after {
  content: attr(tooltip);
  bottom: calc(100% - 5px);
  left: 50%;
  transform: translateX(-50%);

  width: min(420px, calc(100vw - 30px));
  max-width: calc(100vw - 30px);

  padding: 12px 14px;
  border-radius: 4px;
  background-image: linear-gradient(rgba(0, 69, 61, 1), rgba(0, 0, 0, 0.9));
  color: #fff;
  font-family: Helvetica, sans-serif;
  font-size: 13px;
  line-height: 16px;
  text-align: center;
  white-space: normal;
  box-shadow: 0 1em 2em -.5em rgba(0, 0, 0, 0.35);
}

li[tooltip]:hover::before,
li[tooltip]:hover::after {
  display: block;
  opacity: .95;
}