Clean dark blue theme.
[{"featureType":"all","elementType":"all","stylers":[{"invert_lightness":true},{"saturation":10},{"lightness":30},{"gamma":0.5},{"hue":"#435158"}]},{"featureType":"administrative","elementType":"all","stylers":[{"color":"#89c0eb"},{"visibility":"simplified"}]},{"featureType":"landscape","elementType":"all","stylers":[{"color":"#405769"}]},{"featureType":"water","elementType":"geometry.fill","stylers":[{"color":"#232f3a"}]}]