A login page is a web page or website entry page that requires user identification and authentication, which is often accomplished by providing a username and password combination. Logins might give you access to the full site or just a section of it. Logging in allows the website to track the user's activity and habits in addition to providing site access.
Following is the code for a simple login form/login page in HTML with CSS code. It is a basic login page written completely using HTML. You can use this login form on your website without any restrictions.
You can also download the complete HTML file form here.