Add button style reset code in case the user forgets to do so. #34
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If the user does not reset the default browser styling for buttons, the next and previous buttons will be ugly, because they will have shadows drawn right through the buttons.
The fact that this happens violates the principle of least astonishment, especially for Rails users who expect to be done after adding colorbox-rails to the Gemfile. And even more so if the Rails user is not a CSS guru :-)
This post pointed me in the right direction: http://community.sitepoint.com/t/gray-borders-around-controls-in-colorbox/27750
This pull request fixes the aestetics for sites that do not reset button shadows wholesale.