Help request: How do I fix a 1/2” gap between a counter top and the wall? The counter top is centered on the cabinets and it’s flush against back wall.

Basically, the corner of the vanity top is flush against the back wall and the corner, but the gap between the wall and the counter top increases as you move forward, ending in a 1/2” gap between the two (looks like a triangle if you stand there and look at it). I’d post a pic for reference but auto moderator keeps removing the post when I do.Thanks! via /r/DIY https://ift.tt/38Hc7dX