Large puzzles do not fully utilize the screen space

[Stephcraft]

Small

https://puzzlefy.netlify.app/?cols=4&rows=3

Medium

https://puzzlefy.netlify.app/?cols=9&rows=5

Big

https://puzzlefy.netlify.app/?cols=18&rows=10

Large

https://puzzlefy.netlify.app/?cols=90&rows=50

Perhaps the random piece placement region can also be improved to look more random and balanced.