diff --git a/.github/workflows/vimhelpdeploy.yml b/.github/workflows/vimhelpdeploy.yml
index fc1ce01..0eafe3f 100644
--- a/.github/workflows/vimhelpdeploy.yml
+++ b/.github/workflows/vimhelpdeploy.yml
@@ -14,6 +14,8 @@ jobs:
         uses: tsuyoshicho/action-vimhelp-html-generate@master
         env:
           FOLDER: build
+          BACKGROUND: light
+          COLORSCHEME: github
       - name: deploy gh-pages
         uses: JamesIves/github-pages-deploy-action@releases/v2
         env:
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..59defc4
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tools/github"]
+	path = tools/github
+	url = https://github.com/cormacrelf/vim-colors-github.git
diff --git a/Dockerfile b/Dockerfile
index 2b38b69..efba519 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,17 @@
-FROM thinca/vim:v8.1.2248
+FROM thinca/vim:v8.2.0640
 
-RUN apk --update add tree && \
+RUN apk --update add tree git && \
     rm -rf /var/lib/apt/lists/* && \
     rm /var/cache/apk/*
 
-ADD  tools/ /tools/
+WORKDIR /root
+RUN git clone https://github.com/tsuyoshicho/action-vimhelp-html-generate.git cloned
+WORKDIR /root/cloned
+
+RUN git submodule sync --recursive && \
+    git submodule update --init --recursive
+
+COPY tools/ /tools/
 
 COPY entrypoint.sh /entrypoint.sh
 
diff --git a/README.md b/README.md
index 67e2a75..4c02337 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,8 @@ jobs:
         uses: tsuyoshicho/action-vimhelp-html-generate@v1
         env:
           FOLDER: build
+          BACKGROUND: light
+          COLORSCHEME: github
       - name: deploy gh-pages
         uses: JamesIves/github-pages-deploy-action@releases/v2
         env:
diff --git a/action.yml b/action.yml
index a3218c4..4e042ca 100644
--- a/action.yml
+++ b/action.yml
@@ -5,6 +5,15 @@ inputs:
   FOLDER:
     description: "Build work directory"
     default: 'build'
+    required: false
+  BACKGROUND:
+    description: "HTML background type(light and dark)"
+    default: 'light'
+    required: false
+  COLORSCHEME:
+    description: "HTML colorscheme type(as vim built-ins' and github)"
+    default: 'github'
+    required: false
 runs:
   using: 'docker'
   image: 'Dockerfile'
diff --git a/tools/buildhtml.vim b/tools/buildhtml.vim
index 47dffcc..7ddc8ef 100644
--- a/tools/buildhtml.vim
+++ b/tools/buildhtml.vim
@@ -1,11 +1,11 @@
+" force Vim setting
 set nocompatible
 set nomore
+" base setting
 set encoding=utf-8
 set fileencodings=utf-8
 syntax on
-colorscheme delek
-let g:html_no_progress = 1
-set background=light
+" options
 set wrap
 set ambiwidth=double
 set modeline
@@ -23,8 +23,36 @@ function! s:main()
   " for the lastest help syntax
   let &runtimepath = s:tools_dir . ',' . &runtimepath
   " for ja custom syntax
-  " let &runtimepath .= ',' . s:proj_dir
   let &runtimepath = s:proj_dir  . ',' . &runtimepath
+
+  " additinal plugin/colorscheme
+  for name in ['github']
+    let &runtimepath = s:tools_dir . '/' . name . ',' . &runtimepath
+  endfor
+
+  " colorscheme set
+  let bg = getenv('BACKGROUND')
+  if bg == v:null || (bg isnot? 'light' && bg isnot? 'dark')
+    let bg = 'light'
+  else
+    let bg = tolower(bg)
+  endif
+  let scheme = getenv('COLORSCHEME')
+  if scheme == v:null
+    let scheme = 'delek'
+    if isdirectory(expand(s:tools_dir . '/github'))
+      let scheme = 'github'
+    endif
+  else
+      let scheme = tolower(scheme)
+  endif
+
+  let &background = bg
+  execute 'colorscheme' scheme
+
+  " 2html option
+  let g:html_no_progress = 1
+
   call s:BuildHtml()
 endfunction
 
@@ -44,6 +72,8 @@ function! s:BuildHtml()
   "
   set foldlevel=1000
   call MakeHtmlAll()
+
+  " old additional style
   " add header and footer
   " tabnew
   " " XXX: modeline may cause error.
@@ -53,29 +83,29 @@ function! s:BuildHtml()
   " silent argdo call s:PostEdit() | update!
 endfunction
 
-function! s:PostEdit()
-  set fileformat=unix
-  call s:ToJekyll()
-endfunction
-
-function! s:ToJekyll()
-  let helpname = expand('%:t:r')
-  if helpname == 'index'
-    let helpname = 'help'
-  endif
-  " remove header
-  silent 1,/^<hr>/delete _
-  " remove footer
-  silent /^<hr>/,$delete _
-  " escape jekyll tags
-  silent %s/{\{2,}\|{%/{{ "\0" }}/ge
-  " YAML front matter
-  call append(0, [
-        \ '---',
-        \ 'layout: vimdoc',
-        \ printf("helpname: '%s'", helpname),
-        \ '---',
-        \ ])
-endfunction
+" function! s:PostEdit()
+"   set fileformat=unix
+"   call s:ToJekyll()
+" endfunction
+"
+" function! s:ToJekyll()
+"   let helpname = expand('%:t:r')
+"   if helpname == 'index'
+"     let helpname = 'help'
+"   endif
+"   " remove header
+"   silent 1,/^<hr>/delete _
+"   " remove footer
+"   silent /^<hr>/,$delete _
+"   " escape jekyll tags
+"   silent %s/{\{2,}\|{%/{{ "\0" }}/ge
+"   " YAML front matter
+"   call append(0, [
+"        \ '---',
+"        \ 'layout: vimdoc',
+"        \ printf("helpname: '%s'", helpname),
+"        \ '---',
+"        \ ])
+" endfunction
 
 call s:main()
diff --git a/tools/github b/tools/github
new file mode 160000
index 0000000..acb712c
--- /dev/null
+++ b/tools/github
@@ -0,0 +1 @@
+Subproject commit acb712c76bb73c20eb3d7e625a48b5ff59f150d0
diff --git a/tools/makehtml.vim b/tools/makehtml.vim
index f7219b6..96efd6a 100644
--- a/tools/makehtml.vim
+++ b/tools/makehtml.vim
@@ -73,15 +73,20 @@ function! MakeHtml2(src, dst, conceal)
   silent new `=a:src`
 
   " 2html options
+  let g:html_expand_tabs    = 1
+
   let g:html_ignore_conceal = 1
+
   let g:html_ignore_folding = 1
-  let g:html_line_ids       = 1
-  let g:html_no_pre         = 0
-  let g:html_number_lines   = 1
-  let g:html_use_css        = 1
   let g:html_hover_unfold   = 1
+
+  let g:html_number_lines   = 0
+  let g:html_line_ids       = 0
+
   let g:html_pre_wrap       = 0
-  let g:html_expand_tabs    = 1
+  let g:html_no_pre         = 0
+
+  let g:html_use_css        = 1
   let g:html_use_xhtml      = 0
 
   " set dumy highlight to keep syntax identity