Single post in Site Skins: How-To, and Helpful CSS

Hello! I've recently made my own site skin (just moving some colors around and making it look similar to the dotd1 one but with some minor changes!) And unfortunately the colored bar that tells how close an egg is to hatching (not the timer!) has changed to be the same color as the background, I couldn't find anything about this so far so I thought I might as well ask here! Do you know anyways I can change the bar color to be darker? Or where I could do that? :o