CSS3 Media Queries responding to Ambient lighting. Source: http://www.jordanm.co.uk/post/65776639602/responding-to-environmental-lighting-with-css-media

luminosity.css

@media (luminosity: normal) {
    body {
        background: #f5f5f5;
        color: #262626;
    }
}

@media (luminosity: dim) {
    body {
        background: #e9e4e3;
    }
}

@media (luminosity: washed) {
    body {
        background: #ffffff;
    }
}