body {
    background-color: black;
    color: white;
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    text-align: center;
    transition: background-color 0.3s, color 0.3s;
}

.btn {
    background-color: #333;
    color: white;
    border: none;
    padding: 10px 20px;
    margin-top: 10px;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s;
}

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

.light-mode {
    background-color: white;
    color: black;
}

.light-mode .btn {
    background-color: #ddd;
    color: black;
}

.light-mode .btn:hover {
    background-color: #bbb;
}