body {
    font-family: Arial, sans-serif;
    max-width: 400px;
    margin: 100px auto;
    padding: 20px;
    text-align: center;
}

input, button {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}

.error {
    color: red;
    margin: 15px 0;
}

.logout {
    color: green;
    margin: 15px 0;
}