Colored Buttons

I got this code from: http://www.w3schools.com/bootstrap/bootstrap_buttons.asp

Primary

Warning

but the pretty color schemes don't appear to work. Let's try this different style 

No, it does not show colors either. This next example at least has different color text. 

Submit

Now how about the button color itself?

Yes, that worked. Ok, progress. 

Now what can we do with Links?