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Responsive Login & Signup Form | HTML CSS JavaScript

HTML

				
					<!DOCTYPE html>
<html lang="en">
<head>

<meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta charset="UTF-8"/>
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title>Login & Signup UI</title>
  <link rel="stylesheet" href="style.css"/>
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
  <template id="0WnuoQXB05KkSR1bkyRM"></template>
</head>
<body>
  <div class="container" id="container">
     
   <div class="mobile-switch">
  <button id="mobileSignIn" class="active">Sign In</button>
  <button id="mobileSignUp">Sign Up</button>
</div>
    
    <div class="form-container sign-up-container">
      <form>
        <h1>Create Account</h1>
        <div class="social-icons">
          <a href="#" class="icon"><i class="fab fa-facebook-f"></i></a>
          <a href="#" class="icon"><i class="fab fa-google"></i></a>
          <a href="#" class="icon"><i class="fab fa-linkedin-in"></i></a>
        </div>
        <span>or use your email for registration</span>
        <input type="text" placeholder="Name"/>
        <input type="email" placeholder="Email"/>
        <input type="password" placeholder="Password"/>
        <button>Sign Up</button>
      </form>
    </div>

    
    <div class="form-container sign-in-container">
      <form>
        <h1>Sign in</h1>
        <div class="social-icons">
          <a href="#" class="icon"><i class="fab fa-facebook-f"></i></a>
          <a href="#" class="icon"><i class="fab fa-google"></i></a>
          <a href="#" class="icon"><i class="fab fa-linkedin-in"></i></a>
        </div>
        <span>or use your account</span>
        <input type="email" placeholder="Email"/>
        <input type="password" placeholder="Password"/>
        <a href="#">Forgot your password?</a>
        <button>Sign In</button>
      </form>
    </div>

    
    <div class="overlay-container">
      <div class="overlay">
        <div class="overlay-panel overlay-left">
          <h1>Welcome Back!</h1>
          <div class='code-block code-block-2' style='margin: 8px 0; clear: both;'>
<template id="AG1VnhMNOj6c1IG4N1zs"></template>
<ins class="adsbygoogle"
     style="display:block; text-align:center;"
     data-ad-layout="in-article"
     data-ad-format="fluid"
     data-ad-client="ca-pub-2094722033678002"
     data-ad-slot="2248279416"></ins>
<script type="bv_inline_delayed_js" bv_unique_id="kHDkgnK8qGRfkgmodmRh" defer="1" data-cfasync="" bv_inline_delayed="1" async="">(adsbygoogle = window.adsbygoogle || []).push({});</script></div>
<p>To keep connected, please login with your personal info</p>
          <button class="ghost" id="signIn">Sign In</button>
          <div class="solar-system">
            <div class="planet center"></div>
            <div class="orbit orbit1"><div class="planet"><img bv-data-src="https://cdn-icons-png.flaticon.com/512/300/300221.png"  class="bv-tag-attr-replace bv-lazyload-tag-img"  decoding="async" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%3E"/></div></div>
            <div class="orbit orbit2"><div class="planet"><img bv-data-src="https://cdn-icons-png.flaticon.com/512/733/733547.png"  class="bv-tag-attr-replace bv-lazyload-tag-img"  decoding="async" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%3E"/></div></div>
            <div class="orbit orbit3"><div class="planet"><img bv-data-src="https://cdn-icons-png.flaticon.com/512/145/145807.png"  class="bv-tag-attr-replace bv-lazyload-tag-img"  decoding="async" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%3E"/></div></div>
            <div class="orbit orbit4"><div class="planet"><img bv-data-src="https://cdn-icons-png.flaticon.com/512/2111/2111425.png"  class="bv-tag-attr-replace bv-lazyload-tag-img"  decoding="async" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%3E"/></div></div>
          </div>
        </div>
        <div class="overlay-panel overlay-right">
          <h1>Hello, Friend!</h1>
          <p>Enter your details and start your journey with us</p>
          <button class="ghost" id="signUp">Sign Up</button>
          <div class="solar-system">
            <div class="planet center"></div>
            <div class="orbit orbit1"><div class="planet"><img bv-data-src="https://cdn-icons-png.flaticon.com/512/300/300221.png"  class="bv-tag-attr-replace bv-lazyload-tag-img"  decoding="async" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%3E"/></div></div>
            <div class="orbit orbit2"><div class="planet"><img bv-data-src="https://cdn-icons-png.flaticon.com/512/733/733547.png"  class="bv-tag-attr-replace bv-lazyload-tag-img"  decoding="async" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%3E"/></div></div>
            <div class="orbit orbit3"><div class="planet"><img bv-data-src="https://cdn-icons-png.flaticon.com/512/145/145807.png"  class="bv-tag-attr-replace bv-lazyload-tag-img"  decoding="async" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%3E"/></div></div>
            <div class="orbit orbit4"><div class="planet"><img bv-data-src="https://cdn-icons-png.flaticon.com/512/2111/2111425.png"  class="bv-tag-attr-replace bv-lazyload-tag-img"  decoding="async" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%3E"/></div></div>
          </div>
        </div>
      </div>
    </div>

   
  </div>
  <template id="n6l97mCNOW3l9eC7lINi"></template>
</body>
</html>

CSS

				
					* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Poppins", sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: #f2f2f2;
}

.container {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  position: relative;
  overflow: hidden;
  width: 100%;
  max-width: 1000px;
  min-height: 550px;
  transition: all 0.6s ease-in-out;
  display: flex;
}

.form-container {
  position: absolute;
  top: 0;
  height: 100%;
  transition: all 0.6s ease-in-out;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 50%;
  padding: 40px;
}

form {
  background: #fff;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 350px;
  text-align: center;
}

form h1 {
  margin-bottom: 15px;
}

form input {
  background: #eee;
  border: none;
  padding: 12px 15px;
  margin: 8px 0;
  width: 100%;
  border-radius: 8px;
}

form button {
  border-radius: 20px;
  border: 1px solid #4a00e0;
  background: #4a00e0;
  color: #fff;
  font-size: 14px;
  padding: 12px 45px;
  margin-top: 10px;
  transition: transform 80ms ease-in;
}

form button:hover {
  opacity: 0.9;
}

form a {
  color: #4a00e0;
  font-size: 12px;
  text-decoration: none;
  margin: 8px 0;
}

.social-icons {
  margin: 10px 0;
}

.social-icons .icon {
  height: 40px;
  width: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #ccc;
  border-radius: 50%;
  margin: 0 5px;
  color: #333;
}

.container.right-panel-active .sign-in-container {
  transform: translateX(100%);
}

.sign-in-container {
  left: 0;
  width: 50%;
  z-index: 2;
}

.sign-up-container {
  left: 0;
  width: 50%;
  opacity: 0;
  z-index: 1;
}

.container.right-panel-active .sign-up-container {
  transform: translateX(100%);
  opacity: 1;
  z-index: 5;
}

.overlay-container {
  position: absolute;
  top: 0;
  left: 50%;
  width: 50%;
  height: 100%;
  overflow: hidden;
  transition: transform 0.6s ease-in-out;
  z-index: 100;
}

.container.right-panel-active .overlay-container {
  transform: translateX(-100%);
}

.overlay {
  background: #4a00e0;
  background: linear-gradient(to right, #4a00e0, #8e2de2);
  background-repeat: no-repeat;
  background-size: cover;
  color: #fff;
  position: relative;
  left: -100%;
  height: 100%;
  width: 200%;
  transform: translateX(0);
  transition: transform 0.6s ease-in-out;
  display: flex;
}

.container.right-panel-active .overlay {
  transform: translateX(50%);
}

.overlay-panel {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 30px;
  width: 50%;
}

.overlay-panel h1 {
  font-size: 24px;
  margin-bottom: 10px;
}

.overlay-panel p {
  font-size: 14px;
  margin-bottom: 20px;
}

.overlay-panel button {
  border-radius: 20px;
  border: 1px solid #fff;
  background: transparent;
  color: #fff;
  font-size: 14px;
  padding: 10px 35px;
  transition: background 0.3s;
}

.overlay-panel button:hover {
  background: rgba(255,255,255,0.2);
}

/* Solar System */
.solar-system {
  margin-top: 25px;
  position: relative;
  width: 200px;
  height: 200px;
}

.orbit {
  position: absolute;
  border: 1px dashed rgba(255,255,255,0.3);
  border-radius: 50%;
  animation: rotate 12s linear infinite;
}

.orbit1 { width: 80px; height: 80px; top: 60px; left: 60px; }
.orbit2 { width: 120px; height: 120px; top: 40px; left: 40px; animation-duration: 18s; }
.orbit3 { width: 160px; height: 160px; top: 20px; left: 20px; animation-duration: 25s; }
.orbit4 { width: 200px; height: 200px; top: 0; left: 0; animation-duration: 32s; }

.planet {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  position: absolute;
  top: -20px;
  left: calc(50% - 20px);
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  overflow: hidden;
}

.planet img {
  width: 70%;
  height: 70%;
  object-fit: contain;
}

.planet.center {
  position: absolute;
  width: 60px;
  height: 60px;
  background: #fff;
  top: calc(50% - 30px);
  left: calc(50% - 30px);
}

@keyframes rotate {
  0% { transform: rotate(0deg);}
  100% { transform: rotate(360deg);}
}
.mobile-switch {
  display: none;
}

/* ---------- Redesigned Mobile Styles (Final Fixed) ---------- */
@media (max-width: 768px) {
  body {
    background: #fafafa;
    padding: 20px;
    height: auto;
  }

  .container {
    flex-direction: column;
    width: 100%;
    min-height: auto;
    box-shadow: none;
    background: transparent;
  }

  /* Show solar system on top */
  .solar-system {
    display: block;
    margin: 20px auto;
    width: 160px;
    height: 160px;
  }

  /* Hide overlay panels completely */
  .overlay-container,
  .overlay {
    display: none !important;
  }

  /* Switch tabs for mobile */
  .mobile-switch {
    display: flex;
    justify-content: center;
    margin: 10px auto 20px auto;
    background: #eee;
    border-radius: 30px;
    overflow: hidden;
    width: 90%;
    max-width: 350px;
  }

  .mobile-switch button {
    flex: 1;
    padding: 12px;
    border: none;
    background: transparent;
    color: #555;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
  }

  .mobile-switch button.active {
    background: #4a00e0;
    color: #fff;
  }

  /* Both forms stacked, hidden until active */
  .form-container {
    position: relative;
    width: 100%;
    padding: 25px 20px;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    margin: 10px auto;
    display: none;
    flex-direction: column;

    /* override desktop overlay animation */
    opacity: 1 !important;
    transform: none !important;
    z-index: 1 !important;
  }

  .form-container.active {
    display: flex;
  }

  form {
    max-width: 100%;
    text-align: center;
  }

  form h1 {
    font-size: 22px;
    margin-bottom: 15px;
  }

  form input {
    padding: 14px 15px;
    font-size: 14px;
    margin: 10px 0;
    border-radius: 10px;
  }

  form button {
    width: 100%;
    padding: 14px;
    font-size: 15px;
    margin-top: 15px;
  }

  .social-icons {
    margin-top: 20px;
  }

  .social-icons .icon {
    width: 45px;
    height: 45px;
    margin: 0 8px;
  }
}

/* Smallest screens */
@media (max-width: 480px) {
  form h1 {
    font-size: 20px;
  }
  form input {
    font-size: 13px;
    padding: 12px;
  }
  form button {
    font-size: 14px;
    padding: 12px;
  }
  .solar-system {
    width: 140px;
    height: 140px;
  }
}

JavaScript

				
					document.addEventListener("DOMContentLoaded", function () {
  const container = document.getElementById("container");

  // ---------- Desktop Overlay Buttons ----------
  const signUpButton = document.getElementById("signUp");
  const signInButton = document.getElementById("signIn");

  if (signUpButton && signInButton && container) {
    signUpButton.addEventListener("click", () => {
      container.classList.add("right-panel-active");
    });

    signInButton.addEventListener("click", () => {
      container.classList.remove("right-panel-active");
    });
  }

  // ---------- Mobile Switch Buttons ----------
  const mobileSignIn = document.getElementById("mobileSignIn");
  const mobileSignUp = document.getElementById("mobileSignUp");
  const signInForm = document.querySelector(".sign-in-container");
  const signUpForm = document.querySelector(".sign-up-container");

  if (mobileSignIn && mobileSignUp && signInForm && signUpForm) {
    // Default state: show Sign In
    mobileSignIn.classList.add("active");
    signInForm.classList.add("active");

    // Switch to Sign In
    mobileSignIn.addEventListener("click", function () {
      mobileSignIn.classList.add("active");
      mobileSignUp.classList.remove("active");
      signInForm.classList.add("active");
      signUpForm.classList.remove("active");
    });

    // Switch to Sign Up
    mobileSignUp.addEventListener("click", function () {
      mobileSignUp.classList.add("active");
      mobileSignIn.classList.remove("active");
      signUpForm.classList.add("active");
      signInForm.classList.remove("active");
    });
  }
});

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