The html should look something like this:

<form action="/login">
  <input type="text" placeholder="username">
  <input type="password" placeholder="password">
  <input type="submit">
</form>

which will send a GET request to YOUR_URL/login?username=USERNAME&password=PASSWORD

Why u no do it your self

well you have to make login.html and add a required on each input so that it says required and you have to put on the form method="GET"

You can do same things very easily using PHP and MySQL. you can checkout this registration and login system in PHP and MySQL to quick understanding basic PHP flow.

PHP is the easiest way to do it for a website, you are going to need an SQL database, Web Server, and PHP. here is a simple one I made a while back http://tortolita.is-great.org/login.php here is a very nice tutorial. https://www.tutorialrepublic.com/php-tutorial/php-mysql-login-system.php

No, but I can guess that your probably going to be using html. @K1NGBOSS