What's the CSS Style or Element ID for "Search thread"

[warlord0]

I'm using a dark theme on our site and have one element that seems a bit rogue. It's a text input box an is very pale grey (or even white) on white. It's the search element when you're in a thread.

Most stuff I use Firefox and use Inspect Element on, but I can't get this as it disappears when the context menu appears.

https://vborg.vbsupport.ru/external/2012/07/32.png

Can someone let me know the element ID or CSS attribute I can change to fix this please?

Edit: This is on vb 4.2

[warlord0]

Thanks to BirOfPrey5 all sorted.

.popupbody li input.searchbox {
color:black !important;
}