Simple Tooltip Pure CSS Pseudo!
http://kangrian.com
HTML
<h2>KangRian.com</h2>CSS
h2 {
font-family:arial, sans-serif;
color:white;
background:red;
display:inline-block;
position:relative;
padding:10px 20px;
border-radius:3px;
}
h2::after {
position:absolute;
top:calc(100% + 10px);
left:50%;
margin-left:-10px;
content:"";
border:10px solid;
border-color:transparent transparent red transparent;
}