Colorbox's overlay not showing

I just started using Colorbox modal plugin and cannot figure out how to get the overlay.

jQuery:

$("#button_writereview").colorbox();

HTML:

<a id="button_writerevie开发者_开发百科w" href="...">Link</a>

I notice in the examples that they used a css file and a empty div called cboxOverlay in the html file. How does this work?

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You definitely need to use one of the css files in the examples or write your own. This is what controls the appearance of colorbox's windows/overlays/buttons etc.

The cboxOverlay element and all other necessary elements are created dynamically when you open one of the windows - you don't have to add it, or any other markup manually. When you saw it, you were probably looking at the generated source after opening one (Firebug?) - it shouldn't be there otherwise.