My .htaccess file that redirects users to a maintenance page but the page is displayed without any of my css styling

My .htaccess file that redirects users to a maintenance page but the page is displayed without any of my css styling

My .htaccess file that redirects users to a maintenance page but the page is displayed without any of my css styling

My .htaccess file that redirects users to a maintenance page but the page is displayed without any of my css styling

My .htaccess file that redirects users to a maintenance page but the page is displayed without any of my css styling

My .htaccess file that redirects users to a maintenance page but the page is displayed without any of my css styling

I’m a newbie to .htaccess and came across a a line that I think needs to be in the htaccess file. That lines reads “php_value session.auto_start 1.” If I understand correctly this is all I need to do for all the files in the directory where htaccess is located. Currently every files contains the code below.

I need it to

I am trying to map.htaccess to /books or /books/ or /books/<url_slug>:

I have been looking for a solution, but only found one similar case without an answer (unfortunately). Although the implementation is working, I am still missing one crucial aspect.