How do I cover a shadow?

My goal is to have the “All Contacts” tab in the screenshot below appear to overlap the container on the right, which has the shadow effect. I have tried playing around with the Z-axis settings but it seems that the shadow is visible no matter what I do.
image

you could try making the all contact div slightly bigger so that it overlaps the container on the right

Setting the z axis should work, how do you position the all contacts tab there?

@luka The right edge is flush with the left edge of the container on the right.

I tried adding a div with a white background to the right of the + button and set the margin so that it overlapped the edge of the container on the right. I made sure the overflow was set to visible on the tab container but the shadow was still visible over that div.

Can you send me your editor link in my dms? I can take a look for you