body {
    background: #1f1f1f !important;
}

/* Lighten help-block text color in dark mode */
.text-muted {
    color: #bbb3b3 !important; /* or any lighter color of your choice */
}

.invert {
filter: invert(100%)
}

.binarize {
filter: grayscale(100%) brightness(1000%) contrast(10000000%);
}

.invert-binarize {
filter: invert(100%) grayscale(100%) brightness(1000%) contrast(10000000%);
}