DocsAllOver Responsive Interactive Login & Register Form with CSS & JS Transitions Snippets

Responsive Interactive Login & Register Form with CSS & JS Transitions

Aug. 4, 2025

CSS, Responsive, Card, Login Page, Clean UI, Form, Login Form, Ecommerce, Registration Form

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- BOXICONS -->
    <link href="https://unpkg.com/boxicons@2.1.4/css/boxicons.min.css" rel="stylesheet">
    <title>Responsive Interactive Login & Register Form With CSS & JS Transitions</title>
</head>
<body>
    <div class="wrapper">
        <div class="form-header">
            <div class="titles">
                <div class="title-login">Login</div>
                <div class="title-register">Register</div>
            </div>
        </div>
        <!-- LOGIN FORM -->
        <form action="#" class="login-form" autocomplete="off">
            <div class="input-box">
                <input type="text" class="input-field" id="log-email" required>
                <label for="log-email" class="label">Email</label>
                <i class="bx bx-envelope icon"></i>
            </div>
            <div class="input-box">
                <input type="password" class="input-field" id="log-pass" required>
                <label for="log-pass" class="label">Password</label>
                <i class="bx bx-lock-alt icon" ></i>
            </div>
            <div class="form-cols">
                <div class="col-1"></div>
                <div class="col-2">
                    <a href="#">Forgot password?</a>
                </div>
            </div>
            <div class="input-box">
                <button class="btn-submit" id="SignInBtn">Sign In <i class="bx bx-log-in" ></i></button>
            </div>
            <div class="switch-form">
                <span>Don"t have an account? <a href="#" onclick="registerFunction()">Register</a></span>
            </div>
        </form>

        <!-- REGISTER FORM -->
        <form action="#" class="register-form" autocomplete="off">
            <div class="input-box">
                <input type="text" class="input-field" id="reg-name" required>
                <label for="reg-name" class="label">Username</label>
                <i class="bx bx-user icon" ></i>
            </div>
            <div class="input-box">
                <input type="text" class="input-field" id="reg-email" required>
                <label for="reg-email" class="label">Email</label>
                <i class="bx bx-envelope icon"></i>
            </div>
            <div class="input-box">
                <input type="password" class="input-field" id="reg-pass" required>
                <label for="reg-pass" class="label">Password</label>
                <i class="bx bx-lock-alt icon" ></i>
            </div>
            <div class="form-cols">
                <div class="col-1">
                    <input type="checkbox" id="agree">
                    <label for="agree"> I agree to terms & conditions</label>
                </div>
                <div class="col-2"></div>
            </div>
            <div class="input-box">
                <button class="btn-submit" id="SignUpBtn">Sign Up <i class="bx bx-user-plus" ></i></button>
            </div>
            <div class="switch-form">
                <span>Already have an account? <a href="#" onclick="loginFunction()">Login</a></span>
            </div>
        </form>
    </div>
</body>
</html>

/* IMPORT FONT */
@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

/* COLOR VARIABLES */
:root {
    --primary-color: #0d6efd;
    --secondary-color: #535354;
    --background-color: #EFEFEF;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --white-color: #FFF;
    --black-color: #000;
    --input-border-color: #E3E4E6;
    --transition-3s: 0.3s;
}

/* GLOBAL STYLES */
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

/* REUSABLE ELEMENTS */
a{
    text-decoration: none;
    color: var(--black-color);
    transition: var(--transition-3s);
}
a:hover{
    text-decoration: underline;
}

body{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: var(--background-color);
}

/* WRAPPER */
.wrapper{
    position: relative;
    width: 430px;
    height: 500px;
    background-color: var(--white-color);
    border-radius: 15px;
    padding: 120px 32px 64px;
    border: 1px solid var(--primary-color);
    box-shadow: 0 8px 15px var(--shadow-color);
    transition: var(--transition-3s);
    overflow: hidden;
}
/* FORM HEADER */
.form-header{
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 140px;
    height: 70px;
    background-color: var(--primary-color);
    border-radius: 0 0 20px 20px;
}
.form-header::before, .form-header::after{
    content: "";
    position: absolute;
    top: 0;
    width: 30px;
    height: 30px;
}
.form-header::before{
    left: -30px;
    border-top-right-radius: 50%;
    box-shadow: 15px 0 0 var(--primary-color);
}
.form-header::after{
    right: -30px;
    border-top-left-radius: 50%;
    box-shadow: -15px 0 0 var(--primary-color);
}
/* TITLES */
.titles{
    position: relative;
}
.title-login, .title-register{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    color: var(--white-color);
    font-size: 24px;
    transition: var(--transition-3s);
}
.title-register{
    top: 50px;
}

/* FORMS */
.login-form, .register-form{
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 85%;
    transition: var(--transition-3s);
}
.register-form{
    left: 150%;
}

/* INPUT FIELDS */
.input-box{
    position: relative;
    display: flex;
    flex-direction: column;
    margin: 20px 0;
}
.input-field{
    width: 100%;
    height: 55px;
    font-size: 16px;
    background: transparent;
    color: var(--black-color);
    padding: 0 20px;
    border: 1px solid var(--input-border-color);
    border-radius: 30px;
    outline: none;
    transition: var(--transition-3s);
}
.input-field:focus{
    border: 1px solid var(--primary-color);
}
.label{
    position: absolute;
    top: 50%;
    left: 20px;
    transform: translateY(-50%);
    color: var(--secondary-color);
    transition: 0.2s;
    cursor: text;
}
.input-field:focus ~ .label,
.input-field:valid ~ .label{
    top: 0;
    font-size: 14px;
    background-color: var(--white-color);
    color: var(--primary-color);
    padding: 0 10px;
}
.input-field:valid ~ .label{
    color: var(--secondary-color);
}
.icon{
    position: absolute;
    top: 50%;
    right: 25px;
    transform: translateY(-50%);
    font-size: 20px;
    color: var(--secondary-color);
}
/* FORGOT PASSWORD & TERMS AND CONDITIONS */
.form-cols{
    display: flex;
    justify-content: space-between;
    font-size: 14px;
}
.col-1{
    display: flex;
    align-items: center;
    gap: 6px;
}
/* SUBMIT BUTTON */
.btn-submit{
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--white-color);
    font-size: 16px;
    font-weight: 500;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition-3s);
}
.btn-submit:hover{
    gap: 15px;
}
.btn-submit i{
    font-size: 20px;
}
/* SWITCH FORM */
.switch-form{
    text-align: center;
}
.switch-form a{
    font-weight: 500;
}

/* RESPONSIVE STYLES */
@media only screen and (max-width: 564px){
    .wrapper{
        margin: 20px;
    }
}

const loginForm = document.querySelector(".login-form");
const registerForm = document.querySelector(".register-form");
const wrapper = document.querySelector(".wrapper");
const loginTitle = document.querySelector(".title-login");
const registerTitle = document.querySelector(".title-register");
const signUpBtn = document.querySelector("#SignUpBtn");
const signInBtn = document.querySelector("#SignInBtn");

function loginFunction() {
    loginForm.style.left = "50%";
    loginForm.style.opacity = 1;
    registerForm.style.left = "150%";
    registerForm.style.opacity = 0;
    wrapper.style.height = "500px";
    loginTitle.style.top = "50%";
    loginTitle.style.opacity = 1;
    registerTitle.style.top = "50px";
    registerTitle.style.opacity = 0;
}

function registerFunction() {
    loginForm.style.left = "-50%";
    loginForm.style.opacity = 0;
    registerForm.style.left = "50%";
    registerForm.style.opacity = 1;
    wrapper.style.height = "580px";
    loginTitle.style.top = "-60px";
    loginTitle.style.opacity = 0;
    registerTitle.style.top = "50%";
    registerTitle.style.opacity = 1;
}

This snippet showcases a responsive and interactive login and register form, providing a seamless and engaging user authentication experience with smooth CSS and JavaScript transitions between the two forms.

Key Features:

Responsive Design: The login and register forms adapt fluidly to different screen sizes, ensuring optimal viewing and interaction on desktops, tablets, and mobile devices.
Interactive Form Switching: Allows users to easily toggle between the login and register forms with a clear visual cue, enhancing usability.
Smooth CSS/JS Transitions: Incorporates elegant CSS transitions and minimal JavaScript to create a fluid and visually appealing animation when switching between the forms.
Clear Input Fields: Both the login and register forms feature clearly labeled and intuitive input fields for email, password, and username.

Implementation:

Create the HTML Structure: Set up the basic HTML structure for both the login and register forms, typically within a single container, with distinct sections for each form.
Apply CSS Styles: Use CSS to style the forms, input fields, buttons, and the overall container. Crucially, define the initial states and target styles for the transitions.
Add JavaScript Functionality: Implement JavaScript to handle the click events for switching between the login and register forms. This typically involves adding/removing classes to trigger the CSS transitions and show/hide the appropriate form.
Define CSS Transitions: Apply transition properties to the form elements or their container to animate properties like opacity, transform, or height when the JavaScript toggles their visibility or position.

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