Just to clarify the steps a bit, in case you're unfamiliar with them...
To copy a style you'd first
Create New Style and then hit the
Copy button of the style you want to start with.
Then, under "Name, Images & Wrapper", you'll want to rename the style. You should now save it (
Update or Add Style), then come back to it and make your changes in each of the style Properties sections.
If you need help with the hexadecimal color values (e.g., #004455), you can use a tool like
this to determine the color values.