Haven't been able to find what I'm looking for in .htaccess QA's on here so forgive me if this is duplicate. I have the following problem with a static HTML site. Structure is below.
My relative paths in info.html and contact.html have to use /home/css/style.css while index.html uses /css/style.css. Thanks for help.  
Root
- .htaccess
↳ Drupal
  - .git
↳ Dev
  - .git
↳ Home
  - .htaccess
  - .git
  - css
  - js
  - img
  - info.html
  - contact.html
  - index.html
Goal
Dev.example.comto use all the files from/Devexample.comto use all the files fromexample.com/homeexample.com/infoto redirect fromexample.com/home/info.html.example.com/contactto redirect fromexample.com/home/contact.html.
What I've tried so far
in root .htaccess
      # Set a default home directory, (this subfolder always loads)
  # RewriteEngine On
  # RewriteCond %{THE_REQUEST} ^GET\ /home/
  # # RewriteCond %{HTTP_HOST} ^(www\.)?example.com$
  # RewriteRule ^home/(.*) /$1 [L,R=301]
  # RewriteCond %{HTTP_HOST} ^(www\.)?example.com$
  # RewriteRule !^home/ home%{REQUEST_URI} [L]
  Options -Indexes
  ErrorDocument 404 /missing.html
  # compress text, html, javascript, css, xml:
  AddOutputFilterByType DEFLATE text/html text/plain text/xml application/xml application/xhtml+xml text/javascript text/css application/x-javascript
  BrowserMatch ^Mozilla/4 gzip-only-text/html
  BrowserMatch ^Mozilla/4.0[678] no-gzip
  BrowserMatch bMSIE !no-gzip !gzip-only-text/html
  <FilesMatch "\.(htm|html|css|js)$">
  AddDefaultCharset UTF-8
  </FilesMatch>
  RedirectMatch 404 "(?:.*)/(?:\.git|file_or_dir)(?:/.*)?$"
  # remove .html from html file names
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteRule .*[^/]$ %{REQUEST_URI}/ [L,R=301]
  RewriteCond %{REQUEST_FILENAME}.html -f
  RewriteRule ^(.+)/$ $1.html [L]
And in Root/drupal .htaccess
default drupal stuff
Closest answers I could find on SO:
- .htaccess rewrite to redirect root URL to subdirectory
 - Changing all my website links: what is the best way?
 - Redirecting root of site to subdirectory using .htaccess
 - htaccess subdirectory URLS to root
 
EDIT: I ended up following, partially, the advice given because I have separate git repos per subdirectory. Thanks @Jon Lin and @tttony!
New problem: My .htaccess in root doesn't let me view my drupal installation in subfolder.
Drupal.examples.comuses all the drupal files from/Drupal**