body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
}

pre {
    background-color: #f4f4f4;
    padding: 10px;
    border-radius: 5px;
    overflow: auto;
    white-space: pre-wrap;
}

button {
    display: block;
    margin: 20px auto;
    padding: 10px 20px;
    font-size: 16px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.light-mode {
    background-color: #ffffff;
    color: #333;
}

.light-mode pre {
    background-color: #f4f4f4;
}

.dark-mode {
    background-color: #333;
    color: #f4f4f4;
}

.dark-mode pre {
    background-color: #444;
}