Forgot that colors for diff are horrible too, so need to be modified ... 

 " Change colors for vimdiff to make text readable.
 if &diff
   syn off
   hi clear

   " Magenta.
   " Text with no changes.
   highlight Normal term=none cterm=italic ctermfg=5 ctermbg=0

   " Green.
   " Text added; appears beside text-removed.
   highlight DiffAdd    term=bold,underline  cterm=bold ctermfg=2 cter
+mbg=0  gui=none  guifg=bg guibg=Red
   "
   " Red.
   " Text removed, namely "-----" indicator.
   highlight DiffDelete term=reverse   cterm=bold ctermfg=1 ctermbg=0 
+ gui=none  guifg=bg guibg=Red

   " White
   " Text of the line with change.
   highlight DiffChange term=underline cterm=none ctermfg=7 ctermbg=0 
+ gui=none  guifg=bg guibg=Red
   "
   " Yellow.
   " Changed text.
   highlight DiffText   term=bold      cterm=bold ctermfg=3 ctermbg=0 
+ gui=none  guifg=bg guibg=Red
 endif

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In reply to Re^2: colours for syntax highlighting by Anonymous Monk
in thread colours for syntax highlighting by morgon

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