server {
    listen 80;
    server_name your_domain.com;

    root /var/www;

    # Main location block
    location / {
        try_files $uri $uri/ =404;
    }

    # User directories
    location ~ ^/~(.+?)(/.*)?$ {
        alias /var/www/$1$2;
        autoindex on;
        index index.html;
        try_files $uri $uri/ /~$1/index.html;
    }

    error_page 404 /404.html;
    location = /404.html {
        internal;
    }
}