[Eric] How do I change eric4 background color ?

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I just installed eric4 for the first time (on windows eric4.4) and  for 
.py i can change the background colors in Settings -> preferences -> 
editor -> highlighters -> styles -> python,  BUT i get an annoying white 
vertical 1px margin between the actual editor and the 
debuggermargincolumn (i disabled both folding margin and linenumber 
column).

If the script is only few line long, the background color does not go 
all the way down and a white strip is displayed where there are no 
actual lines of code yet written. How do i edit this 
background-background white color ? Its annoying.

thanks