In a post, when you click on the “add an image” icon and it adds the image, once you have your cursor over the image, it gives you the option of editing the image.
When you click on that icon, and click on Advanced settings at the top, you see ‘border’, ‘vertical’, and ‘horizontal’. Previously, I was putting 0 in border and 5 in both vertical and horizontal, but even when I do that now, I still have a border….