After changing the booru's base URL in .env, where can I put my new index.html?

[crowscrows]

Suppose I change the BASE_URL="/booru/" for mybooru.com
Now to access the booru I assume users will have to add the /booru/ extension to the domain name like so : mybooru.com/booru

My question is if I want to make my own home page for mybooru.com, what file should I modify? (or rather, where should I put my new index.html file?)

[crowscrows]

Solution : if the index.html is static, simply put your html/css files in /usr/share/nginx/html/ and it should work