Hermano Esto te servira par algo

<div id="talkbubble"></div><style> #talkbubble {width:120px;
height:80px; background:red; position:relative;
-moz-border-radius:10px; -webkit-border-radius:10px; border-radius:
10px;} #talkbubble:before {content:""; position:absolute; right:100%;
top:26px; width:0; height:0; border-top:13px solid transparent;
border-right:26px solid red; border-bottom:13px solid transparent;}
</style>