diff --git a/vimrc b/vimrc
index ce5ae56..b583405 100644
--- a/vimrc
+++ b/vimrc
@@ -107,6 +107,10 @@ if exists('+cursorline')
 	highlight CursorLine term=bold cterm=bold
 endif
 
+" display box from column 81 to 100
+let &colorcolumn=join(range(81, 100), ",")
+highlight ColorColumn ctermbg=235 guibg=#2d2d2d
+
 " display line numbers
 set number