Add Content Security Policy security header to WordPress site

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Can someone please let me know if I am typing something wrong when I set the CSP in the htaccess file:

<IfModule mod_headers.c> Header set Content-Security-Policy default-src ‘none’; script-src ‘self’; connect-src ‘self’; img-src ‘self’; style-src ‘self’; </IfModule>

I am using a child theme on a VPS with Apache and Nginx.

I am following the recommendations set by a plugin called “Security Ninja”, The CSP is not implemented, I tried restarting Apache, Nginx to no avail.

TIA

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