.center {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%);
    width: 128px;
}

.light {
    background: #eee;
    color: black;
}

.dark {
    background: #000;
    color: white;
}

@media (prefers-color-scheme: dark) {
    .light {
        background: #000;
        color: white;
    }
    .dark {
        background: black;
        color: #ddd;
    }
}

@media (prefers-color-scheme: light) {
    .light {
        background: white;
        color: #555;
    }
    .dark {
        background: #eee;
        color: black;
    }
}