import colorsys


def hs_to_hex(hue: float, saturation: float) -> str:
    """Convert hue and saturation to a string hex color."""
    rgb = colorsys.hsv_to_rgb(hue / 100, saturation / 100, 100)
    return "#{:02x}{:02x}{:02x}".format(
        round(rgb[0]), round(rgb[1]), round(rgb[2])
    ).upper()