Hello,
I saw the screenshot you attached.
1) You can change the background of the header bottom from Woodmart >> Header Builder >> Edit Header.
Screenshot for Clarification: https://prnt.sc/10w0r7g
2) Please try adding the following Custom CSS in the Custom CSS for Desktop area under Theme Settings >> Custom CSS.
.whb-color-light .navigation-style-default .item-level-0>a {
color: black;
}
3) Sorry but your question is not clear enough to understand what you required. Please elaborate on what you require with the help of some relevant screenshots to check it myself and help you out accordingly.
Regards.
Xtemos Studios