赤くする
~/.vimrcに追記してください
[shell gutter="false"] augroup HighlightTrailingSpaces autocmd! autocmd VimEnter,WinEnter,ColorScheme * highlight TrailingSpaces term=underline guibg=Red ctermbg=Red autocmd VimEnter,WinEnter * match TrailingSpaces /\s+$/ augroup END [/shell]