Is the bucket-fill tool at 100% opacity?
By the way, if you do this often, a faster solution is to use the Drop Shadow tool (no offset, no blur, a little bit of growth, full opacity). The neat side is that you can save the settings (+ icon near the top of the dialog) to apply them again quickly later.
By the way, if you do this often, a faster solution is to use the Drop Shadow tool (no offset, no blur, a little bit of growth, full opacity). The neat side is that you can save the settings (+ icon near the top of the dialog) to apply them again quickly later.