Hello,
1/ Theme Options > Header builder > Search > Style > WCAG Color > Custom
2/ Apperance > Menus > edit All departments menu > change images https://gyazo.com/077a26e3542142943f6af6e11d8ea76e
Edit page and change colors – https://gyazo.com/14d946de11e139cdd96c565acb3a734b
Theme Options > Syling > Active buttons https://gyazo.com/3b6a627a87c2c0e3f7cc6327e166ccc6
Clear cache of browser to be able to see result of changes.
Let us know if you need any further assistance.
Regards