body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: #333333;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
}

.form-container {
    background: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    margin-top: 20px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

h1, h2, h3 {
    color: #333;
}

a {
    color: #333;
    text-decoration: none;
}

a:hover {
    color: #666;
}

.btn {
    display: inline-block;
    background: #333;
    color: #fff;
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    font-size: 15px;
}

.btn:hover {
    background: #555;
    color: #fff;
}

input[type="text"], input[type="email"], input[type="password"] {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border-radius: 5px;
    border: 1px solid #ddd;
}

.alert {
    padding: 10px;
    background: #f4f4f4;
    margin-bottom: 10px;
    border-radius: 5px;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
}

.alert-success {
    background: #d4edda;
    color: #155724;
}

.nav {
    background: #333;
    color: #fff;
    padding: 10px;
    margin-bottom: 20px;
}

.nav a {
    color: #fff;
    margin-right: 10px;
}

.nav a:hover {
    color: #ddd;
}