ErrorDocument 403 /404.php
ErrorDocument 404 /404.php
DirectoryINdex index.php

<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?page=$1 [L,QSA]

RewriteCond %{REQUEST_URI} !^/$
RewriteCond %{REQUEST_URI} !^/admin
RewriteRule .*/ [L,R=301]
</IfModule>