Is your feature request related to a problem? Please describe.
In dark settings the gray background is a sharper contrast and it would be nice if the opacity could be lowered so that it is less noticeable but still helps the text stand out.

Describe the feature you'd like
Similar to how there is a color picker for the text it would be nice if there was an ability to change the opacity of the background and possibly also the color.

Describe alternatives you've considered
You can disable the background completely but this is not desirable to me as I just want it to be less bright.

Additional context
Here is an image where you can see how bright the background seems in a dark setting