Tilemaps - How to make one Tilemap darker than another?

I have a 2D scene where I want to make a sidescroller/platformer. I'm using a Tilemap as the ground where the player moves his or her character. I then make a second Tilemap, which acts as a background. The ground Tilemap is on Order Layer 0 (same as player), and the background Tilemap is on Order Layer -10.

This seems to do the job, except that the background Tilemap looks the same as the ground Tilemap. I mean, the tint and size are the same.

Is there a way to make the background Tilemap a bit faded, or have a darker, shadowy tint?

Thanks!

 

Have you tried creating a material and give it a new color? If not, you may be able to click on the tile, look in the inspector and see if you have smoothnes, alpha, metalic, etc controls to alter the color. You can also try looking to see if the tile has a child object in the hierarchy. You may get lucky and get your color picker on the child object.