set the sides color of emacs

[lingzedong]

I set my emacs background color to dark-slate-gray, but there are black two
sides between the background and fringes, I want set them to dark-slate-gray
also, how should I do to .emacs?

by the way, I wanted to replace the default compile command "make -k " with
"g++ -o" , and set the default file load path to "/home/name/data " in c++
mode 
how can I do it?

need some helph
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