Hello,

Please add this code to the Theme Settings > Custom CSS > Global:

/*sticky main menu color*/
body .whb-sticked .woodmart-navigation  .item-level-0.current-menu-item>a{
color:yellow;
}
body .whb-sticked .woodmart-navigation  .item-level-0>a{
color:yellow;
}
body .whb-sticked  .woodmart-navigation  .item-level-0>a:hover{
color:red;
}
body .whb-sticked .woodmart-navigation .item-level-0.menu-item-has-children>a:after{
color:yellow;
} 
body .whb-sticked .woodmart-navigation .item-level-0.menu-item-has-children:hover >a:after{
color:yellow;
}

Replace the colors as per your needs.

Best Regards