body {
    background-color: #f4f4f4;
    font-family: Arial;
    margin: 0
}

button {background: transparent}

.container {
    margin: 40px auto;
    text-align: center;
    width: 80%
}

h1 {color: #1f3c88}

.box {
    background-color: blueviolet;
    margin: 20px 0;
    padding: 20px
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: #222;
        color: #f4f4f4
    }

    button {color: #f4f4f4}
}