Hello, @Allan Morrow,
Actually, Yes, you can set the opacity in the box shadow but for this, you have to change the box shadow color code. As you can see in this example: https://stackoverflow.com/questions/5458716/is-it-possible-to-set-transparency-in-css3-box-shadow the color code in the box shadow is set using the “rgba” CSS code. By applying the same method in the CSS code that I shared with you in my previous reply. You can set it as per your requirements.
Regards 8Themes Team.