[snakes1100]

Templates shouldnt have hard coded links with http in them.

But you have to change what PinkMilk stated your URL setting.

You also wont need to the rewrite if everything is correct in the url setting & templates arent using hard coded links.

Once you fix the basics, use this format in htaccess

RewriteCond %{HTTP_HOST} ^xxxxx\.com$ [OR]
RewriteCond %{HTTPS} !on
RewriteRule ^(.*)$ https://www.xxxxxxx.com/$1 [R,L]