Setup nginx as proxy server for your node below script for your reference

    server {

    listen 443 default_server;
    server_name your.domain.com;

    ssl on;
    ssl_certificate /usr/local/nginx/conf/server.pem;
    ssl_certificate_key /usr/local/nginx/conf/server.key;
    ssl_session_cache shared:SSL:10m;

    location / {

        proxy_pass http://localhost:8545; # my existing apache instance
        proxy_set_header Host $host;

        # re-write redirects to http as to https, example: /home
        proxy_redirect http:// https://;
    }}