Booking Form: Changing the style of tips

Hi there,

I placed a tip to a custom field in the booking form and i’d like to change the style of the appearing field (tip when text hovering). It’s basicly in a yellow box with border and Times (font). How can i Change that style? Javascript, CSS, PHP?

Thanks for your help.

Stefan

https://www.ads-software.com/plugins/events-manager/