Cool Gradient Form - MeggiTools

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Cool Gradient Form</title>
    <style>
        @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600&display=swap');
        body, html {
            margin: 0;
            padding: 0;
            height: 100%;
            font-family: 'Poppins', sans-serif;
            background: linear-gradient(45deg, #f3ec78, #af4261);
            display: flex;
            justify-content: center;
            align-items: center;
            perspective: 1000px;
            background-attachment: fixed;
        }
        .form-container {
            width: 350px;
            height: 450px;
            position: relative;
            transform-style: preserve-3d;
            transition: transform 1s;
        }
        .form-container.flipped {
            transform: rotateY(180deg);
        }
        .form-container .front, .form-container .back {
            position: absolute;
            width: 100%;
            height: 100%;
            background: linear-gradient(45deg, #f3ec78, #af4261);
            border-radius: 15px;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            backface-visibility: hidden;
            padding: 30px;
            text-align: center;
            color: white;
        }
        .form-container .back {
            transform: rotateY(180deg);
        }
        .form-container .flip-btn {
            position: absolute;
            top: 15px;
            right: 15px;
            background: #FF6F61;
            color: #fff;
            border: none;
            padding: 10px;
            border-radius: 5px;
            cursor: pointer;
        }
        .form-container .flip-btn:hover {
            background: #FF3F3F;
        }
        .form-container .input-group {
            margin-bottom: 15px;
            position: relative;
        }
        .form-container .input-group input {
            width: 80%;
            height: 45px;
            padding-left: 5%;
            border: none;
            border-radius: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            transition: 0.3s;
        }
        .form-container .input-group input:focus {
            outline: none;
            transform: scale(1.05);
        }
        .form-container .btn {
            background: #FF6F61;
            color: #fff;
            border: none;
            padding: 15px 30px;
            border-radius: 30px;
            cursor: pointer;
            transition: 0.3s;
            display: inline-block;
            font-size: 1em;
        }
        .form-container .btn:hover {
            background: #FF3F3F;
        }
    </style>
</head>
<body>
    <div class="form-container">
        <div class="front">
            <h2>Sign Up</h2>
            <form>
                <div class="input-group">
                    <input type="text" placeholder="Username" required>
                </div>
                <div class="input-group">
                    <input type="email" placeholder="Email" required>
                </div>
                <div class="input-group">
                    <input type="password" placeholder="Password" required>
                </div>
                <button type="submit" class="btn">Sign Up</button>
            </form>
            <button class="flip-btn" onclick="flipCard()">Flip</button>
        </div>
        <div class="back">
            <h2>Login</h2>
            <form>
                <div class="input-group">
                    <input type="text" placeholder="Username" required>
                </div>
                <div class="input-group">
                    <input type="password" placeholder="Password" required>
                </div>
                <button type="submit" class="btn">Login</button>
            </form>
            <button class="flip-btn" onclick="flipCard()">Back</button>
        </div>
    </div>
    <script>
        function flipCard() {
            document.querySelector('.form-container').classList.toggle('flipped');
        }
    </script>
</body>
</html>