Example of styling the tooltip using the :after pseudo-element:

Source Code: (back to article)

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      [data-title]:hover:after {
        opacity: 1;
        transition: all 0.1s ease 0.5s;
        visibility: visible;
      }
      [data-title]:after {
        content: attr(data-title);
        position: absolute;
        bottom: -1.6em;
        left: 100%;
        padding: 4px 4px 4px 8px;
        color: #666;
        white-space: nowrap;
        -moz-border-radius: 5px;
        -webkit-border-radius: 5px;
        border-radius: 5px;
        -moz-box-shadow: 0px 0px 4px #666;
        -webkit-box-shadow: 0px 0px 4px #666;
        box-shadow: 0px 0px 4px #666;
        background-image: -moz-linear-gradient(top, #f0eded, #bfbdbd);
        background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #f0eded), color-stop(1, #bfbdbd));
        background-image: -webkit-linear-gradient(top, #f0eded, #bfbdbd);
        background-image: -moz-linear-gradient(top, #f0eded, #bfbdbd);
        background-image: -ms-linear-gradient(top, #f0eded, #bfbdbd);
        background-image: -o-linear-gradient(top, #f0eded, #bfbdbd);
        opacity: 0;
        z-index: 99999;
        visibility: hidden;
      }
      [data-title] {
        position: relative;
      }
    </style>
  </head>
  <body>
    <p>
      <a href="#" data-title="Example"> Link </a> with styled tooltip
    </p>
    <p>
      <a href="#" title="Example"> Link </a> with normal tooltip
    </p>
  </body>
</html>