Looks like your child theme is working well, good job. ;)
Can you narrow down what you'd like to change? You can identify the the CSS that needs updating by looking at your site with a tool such as Firebug.
For example, inspecting your footer which is also green, you can change it from green
red by adding this to your
Which is a pretty ugly thing to do, but you get the idea. I inspected the element using Chrome's inspect tool but I personally find Firebug on Firefox to be easier to work with.
Edit: I think you may also want to add these lines just above your existing
/* Your original import here */
I believe that will ensure that the other imports are included as well, but check it. My CSS is pretty weak.