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> I want to customize vimrc to change background color to yellow when switched to > "Insert mode".  It should be easy but I can not find how to do it. Any help will > be appreciated. > regards,   :au InsertEnter * hi Normal term=reverse ctermbg=darkgrey guibg=yellow   :au InsertLeave * hi Normal term=NONE    ctermbg=black    guibg=white Change to taste. see         :help InsertEnter         :help InsertLeave         :help :autocmd         :help :highlight