Speech Bubbles (http://jsfiddle.net/taaGc/821/)

gistfile1.html

<div class="bubble" style="background: red; border-color: red;">test</div>
<div class="bubble" style="background: green; border-color: green;">test</div>

<style>
.bubble {
    margin: 50px;
    padding: 50px;
    position: relative;
}
.bubble:after {
    content: "";
    position: absolute;
   top: 100%;
   left: 20px;
   border-top: 20px solid blue;
   border-top-color: inherit; 
   border-left: 20px solid transparent;
   border-right: 20px solid transparent; 
}
</style>