                          hsl(40deg, 100%, 50%),
                                              hsl(0deg, 100%, 50%));
        }

        div.c {
            background-image: linear-gradient(to right in hsl increasing hue,
                                              hsl(0deg, 100%, 50%),
                                              hsl(270deg, 100%, 50%));
        }

        div.d {
            background-image: linear-gradient(to right in hsl increasing hue,
                                             