My nginx include for TLS A+ rating at ssllabs.com/ssltest using nginx/1.14.* and openssl 1.1.1*

TLS

# version 2020 feb 24

ssl_certificate /etc/letsencrypt/live/yardomain.org/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/yardomain.org/privkey.pem;
ssl_trusted_certificate /etc/letsencrypt/live/yardomain.org/chain.pem;

ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
ssl_prefer_server_ciphers off;

# generated using:# openssl dhparam -dsaparam -out /etc/ssl/dh4096.pem 4096
ssl_dhparam /etc/ssl/dh4096.pem;
ssl_ecdh_curve secp384r1;

ssl_stapling on;
ssl_stapling_verify on;

# I use local dnsmasq for faster lookups, highly recommend it!
resolver 127.0.0.1 [::1] valid=4h;
resolver_timeout 9s;

ssl_session_timeout 1d;
ssl_session_cache shared:MozSSL:18m;
ssl_session_tickets off;
ssl_buffer_size 4k;

include /etc/nginx/headers;

don't use
add_header Content-Security-Policy "default-src 'self' 'unsafe-inline' 'unsafe-eval'; img-src 'self' data:;" always;
it ruins all iframes and/or embedded remote media.