Remove the banner box

In the frontpage static banner area (where you put in your main title, subtitle, etc), the whole thing is surrounded by a white box.

I’d like to have no title, no subtitle, no button, etc. but when I leave all of the areas blank (to hide them) the white box remains.

I tried adding .frontpage-banner > .container {
display: none;
}

But that didn’t work. ??

Can someone please tell me how to get rid of the white box in the static banner? I’d like to have only an image up there.