CodePen Embed - ToolTip

<head>
  <link rel="stylesheet" type="text/css" href="https://unpkg.com/hint.css@2.7.0/hint.min.css">
</head>
<body>
  <span class="hint--bottom btn" data-hint="WORLD!">HELLO</span>
</body>

.btn {
  background-color: #5E9CFB;
  border-radius: 10px;
  width: 90px;
  height: 40px;
  line-height: 40px;
  color: white;
  text-align: center;
  cursor: pointer;
  font-weight: bold;
  transition: 0.3s;
  margin: 20px;
}
.btn:hover {
  box-shadow: 0 0 8px #000016;
  transition: 0.3s;
}

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