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Estructura HTML del contenedor de animación CSS

HTML

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Bootstrap 5 Password Toggle with Validation</title>

<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/css/bootstrap.min.css" rel="stylesheet">

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css">

</head>

<div class="text-center mb-4">
            <button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#addUserModal">
                Add User
            </button>
        </div>

<div class="modal fade" id="addUserModal" tabindex="-1" aria-labelledby="addUserModalLabel" aria-hidden="true">
            <div class="modal-dialog">
                <div class="modal-content">
                    <div class="modal-header">
                        <h5 class="modal-title" id="addUserModalLabel">Add User</h5>
                        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                    </div>
                    <form id="addUserForm" novalidate>
                        <div class="modal-body">
                            <p class="text-danger">All star(*) marked fields are mandatory</p>
                            <div id="alertContainer"></div>

<div class="mb-3">
                                <label for="userFirstname" class="form-label">First Name <b class="text-danger">*</b></label>
                                <input type="text" class="form-control" placeholder="First Name" id="userFirstname" required>
                                <div class="invalid-feedback">
                                    First Name is required.
                                </div>
                            </div>

<div class="mb-3">
                                <label for="userLastname" class="form-label">Last Name <b class="text-danger">*</b></label>
                                <input type="text" class="form-control" placeholder="Last Name" id="userLastname" required>
                                <div class="invalid-feedback">
                                    Last Name is required.
                                </div>
                            </div>

<div class="mb-3">
                                <label for="userUsername" class="form-label">Username <b class="text-danger">*</b></label>
                                <input type="text" class="form-control" placeholder="Username" id="userUsername" required>
                                <div class="invalid-feedback">
                                    Username is required.
                                </div>
                            </div>

<div class="mb-3">
                                <label for="userEmail" class="form-label">Email <b class="text-danger">*</b></label>
                                <input type="email" class="form-control" placeholder="Email" id="userEmail" required>
                                <div class="invalid-feedback">
                                    Please enter a valid email address.
                                </div>
                            </div>

<div class="mb-3">
                                <label for="userContact">Contact <b class="text-danger">*</b></label>
                                <div class="input-group">
                                    <span class="input-group-text">+91</span>
                                    <input type="text" class="form-control" placeholder="Enter your 10-digit number" id="userContact" maxlength="10" pattern="\d{10}" required>
                                    <div class="invalid-feedback">
                                        Please enter a valid 10-digit contact number.
                                    </div>
                                </div>
                            </div>

<div class="mb-3">
                                <label for="userPassword" class="form-label">Password <b class="text-danger">*</b></label>
                                <div class="input-group">
                                    <input type="password" class="form-control" placeholder="Password" id="userPassword" pattern=".{8,}" required>
                                    <span class="input-group-text" onclick="togglePassword()">
                                        <i class="fa fa-eye" id="toggleEye"></i>
                                    </span>
                                    <div class="invalid-feedback">
                                        Password must be at least 8 characters long.
                                    </div>
                                </div>
                            </div>

<div class="mb-3">
                                <label for="userRole">Role <b class="text-danger">*</b></label>
                                <select class="form-select" id="userRole" required>
                                    <option value="" disabled selected>Select Role</option>
                                    <option>Admin</option>
                                    <option>Editor</option>
                                    <option>Viewer</option>
                                </select>
                                <div class="invalid-feedback">
                                    Please select a role.
                                </div>
                            </div>
                        </div>
                        <div class="modal-footer">
                            <button type="submit" class="btn btn-primary">Add User</button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/js/bootstrap.bundle.min.js"></script>

</body>

</html>

CSS

@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;700&display=swap');

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

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
}

.login-container {
    width: 100%;
    max-width: 380px;
    background-color: white;
    border-radius: 20px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.2);
    padding: 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin: 20px;
}

.login-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, #5d3fd3, transparent);
    animation: rotate 4s linear infinite;
    z-index: 1;
}

.login-container::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    margin: 5px;
    border-radius: 15px;
    z-index: 2;
}

.login-content {
    position: relative;
    z-index: 3;
}

.login-logo {
    font-size: 2.5rem;
    font-weight: bold;
    color: #5d3fd3;
    margin-bottom: 30px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    outline: none;
    transition: all 0.3s ease;
}

.input-group input:focus {
    border-color: #5d3fd3;
    box-shadow: 0 0 10px rgba(93,63,211,0.2);
}

.login-btn {
    width: 100%;
    padding: 12px;
    background-color: #5d3fd3;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.login-btn:hover {
    background-color: #4a32a8;
    transform: translateY(-3px);
}

.error-message {
    color: #ff4757;
    margin-bottom: 15px;
    display: none;
}

.social-login {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}

.social-btn {
    width: 45%;
    padding: 10px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: bold;
    transition: transform 0.3s ease;
}

.social-btn:hover {
    transform: scale(1.05);
}

.google-btn {
    background-color: #fff;
    border: 1px solid #ddd;
    color: #333;
}

.facebook-btn {
    background-color: #3b5998;
    color: white;
}

@media (max-width: 480px) {
    .login-container {
        width: 90%;
        padding: 20px;
    }

.login-logo {
        font-size: 2rem;
    }

.social-login {
        flex-direction: column;
    }

.social-btn {
        width: 100%;
        margin-bottom: 10px;
    }
}

@keyframes rotate {
    0% { 
        transform: rotate(0deg); 
    }
    100% { 
        transform: rotate(360deg); 
    }
}

function togglePassword() {
            const passwordField = document.getElementById("userPassword");
            const toggleEye = document.getElementById("toggleEye");

if (passwordField.type === "password") {
                passwordField.type = "text";
                toggleEye.classList.remove("fa-eye");
                toggleEye.classList.add("fa-eye-slash");
            } else {
                passwordField.type = "password";
                toggleEye.classList.remove("fa-eye-slash");
                toggleEye.classList.add("fa-eye");
            }
        }

// Custom form validation
        (function () {
            'use strict'

const forms = document.querySelectorAll('.needs-validation')

Array.prototype.slice.call(forms)
                .forEach(function (form) {
                    form.addEventListener('submit', function (event) {
                        if (!form.checkValidity()) {
                            event.preventDefault()
                            event.stopPropagation()
                        }

form.classList.add('was-validated')
                    }, false)
                })
        })();

// Form validation using Bootstrap 5
        document.getElementById('addUserForm').addEventListener('submit', function (event) {
            event.preventDefault(); // Prevent form submission

// Check if form is valid
            if (!this.checkValidity()) {
                event.stopPropagation();
                this.classList.add('was-validated');
            } else {
                alert('User added successfully!');
                // You can add code here to send data to the server or further process the form
                this.reset(); // Reset the form
                this.classList.remove('was-validated');
            }
        });