Vim highlight colors

When used :%s/foo/bar/c

to replace foo in a panel, but with a c tag to have yes or no dialogs for each replacement, I have a truly opaque selection. All occurrences of the search word are displayed with a gray background with white text (normal search highlighting). However, one of the cases I'm asking, "highlighted" in yellow text with no background =>, is easily confused with regular text.

I found a million search shortcuts coloring things up, but nothing is required for this entry for you. How can I only change this one? Thanks for any hint.