Formulario de registro HTML animado

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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Animated Register Form</title>
    <style>
        /* Basic Reset & Body Styling */
        body {
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            color: #333;
            overflow: hidden; /* Prevent scrollbar during initial animation */
        }

/* Form Container */
        .register-container {
            background-color: #fff;
            padding: 40px;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            width: 100%;
            max-width: 400px;
            text-align: center;
            box-sizing: border-box;
            opacity: 0; /* Start hidden for animation */
            transform: translateY(20px); /* Start slightly below for slide-up effect */
            animation: fadeInSlideUp 0.8s ease-out forwards;
            animation-delay: 0.2s; /* Delay the main form animation slightly */
        }

/* Animation Keyframes for main container */
        @keyframes fadeInSlideUp {
            from {
                opacity: 0;
                transform: translateY(50px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

/* Form Title */
        .register-container h2 {
            margin-bottom: 30px;
            color: #333;
            font-size: 2em;
            letter-spacing: 1px;
            opacity: 0; /* Start hidden for animation */
            transform: translateY(-10px); /* Start slightly above for slide-down effect */
            animation: textFadeIn 1s ease-out forwards;
            animation-delay: 0.5s; /* Delay title animation */
        }

/* Animation Keyframes for title */
        @keyframes textFadeIn {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

/* Form Group (for labels and inputs) */
        .form-group {
            margin-bottom: 20px;
            text-align: left;
            position: relative;
        }

.form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #555;
            transition: color 0.3s ease;
        }

.form-group input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 1em;
            box-sizing: border-box;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }

.form-group input:focus {
            outline: none;
            border-color: #2575fc;
            box-shadow: 0 0 8px rgba(37, 117, 252, 0.3);
        }

/* Submit Button */
        .register-button {
            width: 100%;
            padding: 15px;
            background-color: #2575fc;
            color: #fff;
            border: none;
            border-radius: 8px;
            font-size: 1.1em;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
            margin-top: 20px;
            overflow: hidden; /* For ripple effect if added later */
            position: relative;
        }

.register-button:hover {
            background-color: #1a5acb;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }

.register-button:active {
            transform: translateY(0);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }

/* Already have an account link */
        .login-link {
            margin-top: 25px;
            font-size: 0.9em;
            color: #777;
        }

.login-link a {
            color: #2575fc;
            text-decoration: none;
            font-weight: 600;
            transition: color 0.3s ease;
        }

.login-link a:hover {
            color: #1a5acb;
            text-decoration: underline;
        }

/* Optional: Subtle background animation */
        body::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at top left, rgba(255,255,255,0.1) 0%, transparent 50%),
                        radial-gradient(circle at bottom right, rgba(255,255,255,0.1) 0%, transparent 50%);
            animation: backgroundPulse 10s infinite alternate;
            z-index: -1;
        }

@keyframes backgroundPulse {
            0% { opacity: 0.5; }
            100% { opacity: 1; }
        }
    </style>
</head>
<body>
    <div class="register-container">
        <h2>Register Account</h2>
        <form action="#" method="POST">
            <div class="form-group">
                <label for="username">Username</label>
                <input type="text" id="username" name="username" placeholder="Enter your username" required>
            </div>
            <div class="form-group">
                <label for="email">Email</label>
                <input type="email" id="email" name="email" placeholder="Enter your email" required>
            </div>
            <div class="form-group">
                <label for="password">Password</label>
                <input type="password" id="password" name="password" placeholder="Enter your password" required>
            </div>
            <div class="form-group">
                <label for="confirm-password">Confirm Password</label>
                <input type="password" id="confirm-password" name="confirm-password" placeholder="Confirm your password" required>
            </div>
            <button type="submit" class="register-button">Register</button>
        </form>
        <p class="login-link">Already have an account? <a href="#">Login here</a></p>
    </div>
</body>
</html>

CSS