body {
    font-family: Arial, sans-serif;
}

.header, .menu-bar, .container, .footer {
    display: none;
}

.login-form {
    display: none;
    text-align: center;
    margin-top: 100px;
}

.login-form input {
    padding: 10px;
    margin: 5px;
    width: 200px;
}

.login-form button {
    padding: 10px;
    margin: 5px;
    width: 100px;
}

.header {
    background-color: #f8f8f8;
    padding: 20px;
    text-align: center;
}

.menu-bar {
    background-color: #333;
    color: white;
    padding: 10px;
    text-align: right;
}

.menu-bar .logout {
    color: white;
    text-decoration: none;
    margin-left: 20px;
}

.container {
    display: flex;
}

.sidebar {
    width: 200px;
    padding: 20px;
    background-color: #f1f1f1;
}

.main-content {
    flex-grow: 1;
    padding: 20px;
}

.footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px;
}
