# For clean urls
DirectoryIndex index.html

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /

    # Do not do anything for already existing files and folders
    RewriteCond %{REQUEST_FILENAME} -f [OR]
    RewriteCond %{REQUEST_FILENAME} -d
    RewriteRule .+ - [L]

    # add .html file extension (if such file does exist)
    RewriteCond %{DOCUMENT_ROOT}/$1\.html -f
    RewriteRule ^(.+[^/])/?$ $1.html [L,QSA]
</IfModule>