Selected keys in Graph - low contrast

[adambelis]

Its currently hard to see which keys are selected and which are not.

• gray+ bg outline for nonslected
• blue +white for selected

also, colors for lines x and y could be tweaked to be less aggressive overcontrasty

#3f9af5
#f53f41

[adambelis]

since curretn ui uses red for selecion that is also an option to use bu i like blue better

[rodlie]

#155