Currently we use a strong red as background color (255, 0, 0). This might be nice as a demo, but if we want to have a more practice tool we should have a more transparent color for the background. This issue tracks the progress to make it more transparent.
serhack
commented
2 years ago 
Currently we use a strong red as background color (255, 0, 0). This might be nice as a demo, but if we want to have a more practice tool we should have a more transparent color for the background. This issue tracks the progress to make it more transparent.