I play on quite a small display (1536x864) so I've rebuilt most of the graphic files for personal use. this includes the splash screen (at the above aspect ratio).
Feel free to download it yourself -
splashon.bmp - Google Drive
If you let me know your specific screen size (
click here if you don't know it) I'll update that file to match your aspect ratio.
Here's what the splash looks like btw, slightly different to the one most use.
In game screenshot -
https://ibb.co/8Y3tF3S