@kellycheerup glad it worked for you! Also, if you could like my posts (the heart button in the lower right), it shows that I was helpful. 🙂
I can get you started on the font color... this should change the color for the links and the folder... maybe someone else can jump in with the button code.
/* change nav color on blog post pages */
.collection-type-blog #headerNav a {
color: #990000 !important; }
#mainNavigation .folder-toggle {
color: #990000 !important;
}