Especially the red, it is difficult to see because of the low contrast. I would suggest changing the colors to a lighter shade. This is what I see on Windows 11:

I think these alternatives could work better:
- for red
LightCoral #F08080 rgb(240, 128, 128) - for green
LightGreen #90EE90 rgb(144, 238, 144) - for blue
DeepSkyBlue #00BFFF rgb(0, 191, 255) - for orange
Orange #FFA500 rgb(255, 165, 0)