Micro interaction for sign up / sign in form.

Sign in form UI.

Login form UI design using HTML and Sass and jQuery.

Trendy login screen user interface.

Pure CSS sign up form UI.

The button has a hover state which pulls a skewed transparent white overlay over the button's background color. When the button is clicked, the sign in form appears from within the button.

A simple sign up concept.

Registration form with pure CSS animations.

The Hacker Login Form is a unique and creative login form designed to resemble a hacker's terminal. Overall, the Hacker Login Form is a fun and engaging login form that can add a unique touch to any website or application.

A fully responsive, pretty nice, and mobile-friendly login page template written in JavaScript and CSS.

Login form based on Neomorphism Concept

otp-input is a lightweight JavaScript library that makes it easy to create one-time password (OTP) input fields for forms and login flows.

A compact JavaScript library that enhances your form submit buttons with a visual loading spinner, providing immediate and intuitive feedback to users upon submission

You can do a lot with modal windows in web design. They're really useful to get website visitors' attention and use them for any purpose like alert dialogs, login forms, contact forms, etc.