Board Thread:Support Requests - Getting Technical/@comment-1081131-20140521093948

Okay so how do I add a triangle to a border via css like a dialogue box or something like this? How do I change its color or even add a box shadow to it, how do I add its own unique css properties?

Here is what I got so far: http://halofanon.wikia.com/wiki/User:Andromeda_Vadum/Sandbox 