Try it Live

​x
 
<!DOCTYPE html>
<html>
  <head>
    <style>
     .Simple-tooltip .tt-content {
       visibility: hidden;
       background-color: gray;
       padding: 3px;
       color: white;
     }
     
     .Simple-tooltip:hover .tt-content {
       visibility: visible;
       width:200px;
      }
    </style>
  </head>
  <body>
    <h3>Example for Simple Tooltip</h3>
    <div class="Simple-tooltip">
      <div>Hover me</div>
      <section class="tt-content">I am a simple ToolTip</section>
    </div>
  </body>
</html>
​