Background color for text in twine

Twine Version: 2.3.9
Story Format: Harlowe 3.1.0

I’m trying to apply a background color to all the text in my game. In the stylesheet in normal css, this is how i would do it:

body {
background-color: white;

p {
background-color: black;
color: white;

However, in twine, I have to use tw-story, so if i put in background-color, that changes the background color of the whole page. The only other way I can think of is to apply a class to all text in my game, but that would require a lot of work so I want to avoid that outcome if possible.