

how can I customize this button
i'm brand new to html and coding and i've been working on my site for a few days now. one thing i'm trying to include is a button that randomly selects a prompt for writing/art/etc. from a database i've compiled over the years.
i have a functioning button using this code (hence why some of the fields say "songs"), but anything i've tried to customize it doesn't seem to affect it at all. i don't care too much about the appearance aside from that i would like the output text box to be able to be bigger so that the prompt doesn't get cut short if it's a longer one (like in the first photo). the only things from that script code i've changed are the possible outcomes, and i've given the button the div id "promptGen." i don't really understand how the script works so i've been unsure how to edit any of the other values and still retain the usability of the button.
is there something in the code that's overriding my ability to edit the button in css? or are there certain attributes that can't be changed due to the build of the script?
i would appreciate any and all advice, thank you for reading!
my site: https://savearcana.neocities.org/prompts
EDIT: i seem to have gotten the basic css to work! i can change background colors, fonts, etc. but i still am unsure how to change that output bar size.