Text no longer fits background after entering fullscreen mode

Twine Version: 2.5.1
Story Format: Harlowe 3.3.3

Hi! I’m having this issue where I’ve managed to get my text aligned with the background image I chose, but when I enter full-screen mode, it no longer fits within the box.

Here’s the code I’m using for the text so far:
tw-passage {
font-family: times new roman;
text-align: left;
font-size: 2.5vh;
font-size: 2.5vw;
font-size: 2.5vmin;
line-height: normal
position: center

Anyone know how to fix this? Thank you!

A couple of questions:

  1. How exactly are you assigning your background image, and what are the actual dimensions of that image file?
  2. Have you used CSS to alter any of the ancestor/parent elements (like tw-story) of the tw-passage element, and if so what exactly did you do?
  3. Have you suppressed or altered the displaying of the “left sidebar” area, and if so what exactly did you do?
  4. What technique are you using to force the page to enter “full screen” mode?