CSS

.has-tooltip {
background: #ececec;
color: #555;
cursor: help;
font-family: "Gill Sans", Impact, sans-serif;
font-size: 20px;
margin: 100px 75px 10px 75px;
padding: 15px 20px;
position: relative;
text-align: center;
text-transform: uppercase;
width: 200px;
-webkit-transform: translateZ(0); /* webkit flicker fix */
-webkit-font-smoothing: antialiased; /* webkit text rendering fix */
}

.has-tooltip .tooltip {
background: #1496bb;
bottom: 100%;
color: #fff;
display: block;
left: -25px;
margin-bottom: 15px;
opacity: 0;
padding: 20px;
position: absolute;
visibility: hidden;
width: 100%;
-webkit-transform: translateY(10px);
-moz-transform: translateY(10px);
-ms-transform: translateY(10px);
-o-transform: translateY(10px);
transform: translateY(10px);
-webkit-transition: all .25s ease-out;
-moz-transition: all .25s ease-out;
-ms-transition: all .25s ease-out;
-o-transition: all .25s ease-out;
transition: all .25s ease-out;
-webkit-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
-moz-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
-ms-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
-o-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
}

/* This bridges the gap so you can mouse into the tooltip without it disappearing */
.has-tooltip .tooltip:before {
bottom: -20px;
content: " ";
display: block;
height: 20px;
left: 0;
position: absolute;
width: 100%;
}  

/* CSS Triangles - see Trevor's post */
.has-tooltip .tooltip:after {
border-left: solid transparent 10px;
border-right: solid transparent 10px;
border-top: solid #1496bb 10px;
bottom: -10px;
content: " ";
height: 0;
left: 50%;
margin-left: -13px;
position: absolute;
width: 0;
}

.has-tooltip:hover .tooltip {
opacity: 1;
visibility: visible;
-webkit-transform: translateY(0px);
-moz-transform: translateY(0px);
-ms-transform: translateY(0px);
-o-transform: translateY(0px);
transform: translateY(0px);
}