RewriteEngine On

# limit access to .htaccess
<Files .htaccess>
    Order Allow,Deny
    Deny from all
</Files>

# don't rewrite CSS, JS, etc.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

# all other go to index.php
RewriteRule ^(.*)$ index.php?page=$1 [L,QSA]