<details class="tooltip">
  <summary>3 days ago</summary>
  <p>January 27th, 2020</p>
</details>

body {
  padding: 100px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

details {
  position: relative;
  display: inline-block;
  cursor: pointer;
  border-radius: 3px;
  transition: 0.15s background linear;
  &:hover {
    background: #d4d1ec;
  }
}

summary {
  padding: 10px;
  list-style: none;
  background: url("https://assets.codepen.io/14179/Info.svg") 11px 11.5px
    no-repeat;
  padding-left: 33px;
}

details p {
  cursor: auto;
  background: #eee;
  padding: 15px;
  width: 250px;
  position: absolute;
  left: 0;
  top: 35px;
  border-radius: 4px;
  right: 0;

  &:before {
    content: "";
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 12px solid #eee;
    top: -10px;
    position: absolute;
    left: 10px;
  }
}

details[open] p {
  animation: animateDown 0.2s linear forwards;
}

@keyframes animateDown {
  0% {
    opacity: 0;
    transform: translatey(-15px);
  }
  100% {
    opacity: 1;
    transform: translatey(0);
  }
}

const tooltip = document.querySelector(".tooltip");

document.addEventListener("click", function (e) {
  var insideTooltip = tooltip.contains(e.target);

  if (!insideTooltip) {
    tooltip.removeAttribute("open");
  }
});