I’m sorry I couldn’t resist. With any UI elements that display text, you’ll want to make sure that text has good contrast so you don’t give people eyestrain in a game that largely involves reading.
The easiest way to do this is to create a solid background in a color that highly contrasts the text and set it to a high opacity. (Probably at least 80% but whatever looks decent.) This way it should always be readable regardless of the background while still letting a bit of it show through.
Edit: oh, unrelated, but the executable installer is already compressed so putting it in a rar archive does nothing to reduce the size and mandates 3rd party software to get it out in most cases.
If it’s an attempt to work around Windows Defender false-positives, it doesn’t do that either. Just adds an extra step before the AV flips out at you.