I had trouble seeing what was on the SenseHat, in day light, so I design this simple light diffuser. I just screwed it down using two screws and standoffs for the Pi, I had laying around. But some off these should work as well.
The layer of diffusion might vary from what color you are using. I ended up using a slate gray colored filament. If you get a diffusion you don't like, try editing the thickness, depending on what you are after.
This a part of a Raspberry Pi weather station i made, which you can find instructions on how to make on Instructables here: https://www.instructables.com/id/RPi-Weather-Station-and-Digital-Clock/
Here is a demo video: https://www.youtube.com/watch?v=M5oq8HmSQ44