Cacher is the code snippet organizer for pro developers

  <a href="#" class="tooltip" title="Simple Tool Tip">
<img src="../Images/Product_information_RGB_blue_NT.png" height="20px" width="20px" /></a>


/*Tool Tip*/
.tooltip {
    display: inline;
    position: relative;
}

.tooltip:hover {
    color: #c00;
    text-decoration: none;
}

.tooltip:hover:after {
    background: #111;
    background: rgba(0,0,0,.8);
    border-radius: .5em;
    bottom: 1.35em;
    color: #fff;
    content: attr(title);
    display: block;
    left: 1em;
    padding: .3em 1em;
    position: absolute;
    text-shadow: 0 1px 0 #000;
    white-space: nowrap;
    z-index: 98;
}

.tooltip:hover:before {
    border: solid;
    border-color: #111 transparent;
    border-color: rgba(0,0,0,.8) transparent;
    border-width: .4em .4em 0 .4em;
    bottom: 1em;
    content: "";
    display: block;
    left: 2em;
    position: absolute;
    z-index: 99;
}