dismiss notice

Notices dismissable after a specified time like 15 days or so. Thanks

I presume this is a browser/cache issue rather than a xenforo bug. e.g: go to new posts restore dismissed notices. dismiss the notice (NB: I have only tried with floating) click on a post click on browser back button I am finding with Firefox & Chrome, sometimes the dismissed notice comes...

As title. Inspecting the elements, when I right click and choose hover on the CSS, there's no background property. If I try adding one, even with !important, it doesn't appear to work: Edit: Looking at it again, it looks like it put dots on the four corners, but that's not what I want.