.htaccess

# Enables the URL Rewrite Module
RewriteEngine On

# Redirects traffic from HTTP to HTTPS
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

# Remove the .html extension from URLs
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^^]+)$ $1.html [NC,L]

# Redirects URLs without www to URLs with www
RewriteCond %{HTTP_HOST} !^www. [NC]
RewriteRule ^(.*)$ https://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

# Redirects double slash URLs to single slashes
RewriteCond %{REQUEST_URI} ^(.*)//(.*)$
RewriteRule . %1/%2 [R=301,L]

# Set the default file type for index.html
DirectoryIndex index.html

# Prevent direct access to .htaccess and .htpasswd files
<FilesMatch "^\.ht">
    Order Allow,Deny
    Deny from all
</FilesMatch>

# Prevent direct access to the .htpasswd password file
<Files ".htpasswd">
    Require all denied
</Files>

<FilesMatch "\.(css)$">
  Header set Access-Control-Allow-Origin "*"
</FilesMatch>