body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #121212;
    color: #f1f1f1;
}

nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    background-color: #263238;
    display: flex;
    flex-wrap: wrap;
}

nav ul li {
    flex: 1;
    text-align: center;
}

nav ul li a {
    display: block;
    padding: 10px;
    color: white;
    text-decoration: none;
}

nav ul li a:hover {
    background-color: #00bcd4;
}

.container {
    padding: 20px;
}

.alert {
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 4px;
}

.alert.success {
    background-color: #4CAF50;
    color: white;
}

.alert.danger {
    background-color: #f44336;
    color: white;
}

form {
    margin-top: 20px;
}

form input, form button {
    margin-bottom: 10px;
    width: 100%;
    box-sizing: border-box;
}

/* W3.CSS styling for inputs and buttons */
form input.w3-input, form button.w3-btn {
    padding: 10px;
    border-radius: 4px;
    background-color: #333;
    color: white;
    border: 1px solid #444;
    font-size: 16px;
}

form input.w3-input:focus, form button.w3-btn:focus {
    outline: none;
    border-color: #00bcd4;
    box-shadow: 0 0 5px rgba(0, 188, 212, 0.6);
}

form input.w3-input::placeholder, form button.w3-btn::placeholder {
    color: #888;
}

/* Button specific W3.CSS styles */
.w3-btn {
    background-color: #00bcd4;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
}

.w3-btn:hover {
    background-color: #0097a7;
}

/* Card styling */
.w3-card {
    background-color: #2c2c2c;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 15px;
}

.w3-card-4 {
    width: 100%;
    max-width: 500px;
    margin: 20px auto;
}

.w3-theme-cyan {
    background-color: #00bcd4 !important;
    color: white !important;
}

.w3-navbar {
    background-color: #263238;
    border-bottom: 1px solid #444;
}

.w3-navbar a {
    color: white;
}

.w3-navbar a:hover {
    background-color: #00bcd4;
}

.w3-theme-dark {
    background-color: #263238;
    color: white;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .w3-btn {
        width: 100%;
    }

    .w3-card {
        margin: 10px;
    }
}