Override Master CSS visited link on Category Pages

All,

I'm attempting to create four microsite pages on the community for separate vendors.   The tabs on the page are reading the main visited link causing them to be red,  how can I override the CSS for these four separate Category pages?    In one case the OEM background for the active tab is red rendering it invisible.

I'm attempting to create four microsite pages on the community for separate vendors.   The tabs on the page are reading the main visited link causing them to be red,  how can I override the CSS for these four separate Category pages?    In one case the OEM background for the active tab is red rendering it invisible.

I've got some one page CSS and JS running the tabs for the main component but haven't figured our to over-ride the master template.

1.   https://community.brocade.com/t5/OEM-Lenovo-Brocade-Resource-Page/ct-p/OEM-Lenovo-Brocade-Resource-Page  - temporarily turned off the active red tab so the site is usable. 

2.   https://community.brocade.com/t5/OEM-HPE-Brocade-Resource-Page/ct-p/OEM-HPE-Brocade-Resource-Page

It's probably obvious, but I'm having a tough time.