<div>
  <span data-customTooltip="Tooltip text" class="hoverElement">
    Hover on me to see tooltip
  </span>
</div>

<!-- Other Implementations deom  -->
<div class="icons-container">
  <p class="text">Other implementations demo...</p>
  <div class="icons-wrapper">
    <i data-customTooltip="Home" class="fas fa-home"></i>
    <i data-customTooltip="Feed" class="fas fa-rss-square"></i>
    <i data-customTooltip="Messages" class="fas fa-envelope"></i>
    <i data-customTooltip="Notifications" class="fas fa-bell"></i>
  </div>
</div>

/*  ------- General Styles (has nothing to do with tooltip style)  -------  */

@import url("https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,300;0,400;0,500;1,400&display=swap");

body {
  font-family: "Roboto", sans-serif;
  background-color: #d6d6d6;
}
.hoverElement {
  background-color: lightblue;
  padding: 6px 10px;
  border-radius: 5px;
  margin: 30%;
  top: 150px;
}
/* ------------ ------------------ -------------- */

/*------ Tooltip related styles start here -------- */

[data-customTooltip] {
  cursor: pointer;
  position: relative;
}

[data-customTooltip]::after {
  background-color: #fff;
  font-family: "Roboto", sans-serif;
  font-weight: normal;
  color: #222;
  font-size: 14px;
  padding: 8px 12px;
  height: fit-content;
  width: fit-content;
  border-radius: 6px;
  position: absolute;
  text-align: center;
  bottom: 0px;
  left: 50%;
  content: attr(data-customTooltip);
  transform: translate(-50%, 110%) scale(0);
  transform-origin: top;
  transition: 0.14s;
  box-shadow: 0 4px 14px 0 rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(0, 0, 0, 0.05);
}

[data-customTooltip]:hover:after {
  display: block;
  transform: translate(-50%, 110%) scale(1);
}

/* ----- Other implementations demo-----  */

.icons-container {
  margin-top: 300px;
}

.icons-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-around;
  max-width: 500px;
  margin: 0 auto;
  background-color: #222;
  border-radius: 6px;
}

.icons-wrapper > i.fas {
  font-size: 30px;
  color: #f6f6f6;
  padding: 15px;
}