How do I choose the color of the shadow?

First get into the edit mode and click on the pencil icon. Next click on the style tab and choose the shadow icon. Then, choose which edges and click on the edges button. Finally choose the color from the drop down menu.

Step 3: Click on the edge symbol to enable (At least one edge should be enabled)(C)

Step 4: Choose the color (D) from the color palette as per your requirement.

Step 5: Now set the other properties as per your requirement (E and F) and click on "Done".