.wsl-map-grayscale {
    filter: grayscale(100%);
    -webkit-filter: grayscale(100%);
}

.wsl-map-dark {
    filter: invert(100%) hue-rotate(180deg) brightness(95%) contrast(90%);
    -webkit-filter: invert(100%) hue-rotate(180deg) brightness(95%) contrast(90%);
}

/* Try to revert inversion for controls and balloons if possible, 
   but simplistic approach is usually acceptable for loose "dark mode" */
.wsl-map-dark .ymaps-2-1-79-controls__control,
.wsl-map-dark .ymaps-2-1-79-balloon {
    filter: invert(100%) hue-rotate(180deg);
    -webkit-filter: invert(100%) hue-rotate(180deg);
}