echo <input id=kmbefore><input id=kmafter onleave='alert( (kmafter.value - kmbefore.value) * priceperlitterperkm )'>
> index.html to make it available to anyone, Worldwide, for free!
* a server running 24/7 on the internet, paid for each month
* purchased, setup and keep paying every year a domain name
* configured a web server in that server, ideally with automated SSL certificate issue and renewal
Well yes I'm indeed assuming that you have :
- a place with electricity
- an Internet connection
- a computer, no matter how small (it can literally be a-cig)
which isn't true for literally every one but clearly for OP was.
You don't need a server in the cloud though, like I said a home server is enough.
That, or know that https://neocities.org/ exists.
Or just use GitHub pages.