change color margin setting

.vim/colors/smyck.vim

@@ -22,7 +22,7 @@ hi StatusLine           cterm=none ctermbg=8        ctermfg=15      gui=none
 hi StatusLineNC         cterm=none ctermbg=15       ctermfg=8       gui=none        guibg=#5D5D5D   guifg=#FBFBFB
 hi Search               cterm=none ctermbg=6        ctermfg=15      gui=none        guibg=#2EB5C1   guifg=#F7F7F7
 hi IncSearch            cterm=none ctermbg=3        ctermfg=8       gui=none        guibg=#F6DC69   guifg=#8F8F8F
-hi ColumnMargin         cterm=none ctermbg=0                        gui=none        guibg=#000000
+hi ColumnMargin         cterm=none ctermbg=8                        gui=none        guibg=#000000
 hi Error                cterm=none ctermbg=1        ctermfg=15      gui=none                        guifg=#F7F7F7
 hi ErrorMsg             cterm=none ctermbg=1        ctermfg=15      gui=none                        guifg=#F7F7F7
 hi Folded               cterm=none ctermbg=8        ctermfg=2       gui=none        guibg=#8F8F8F   guifg=#C4E858