To achieve specified design, you may need to make two blocks overlap. In Drupal, blocks are the spaces that hold the content we have put into them. This gives us the freedom to place them and then style them wherever on the page we need to achieve design. If the blocks are only for visual purposes, then this would be fine; however, if one of the blocks has a button or other hover/clickable functions, then this might be an issue, especially if that block is covered by the other. The solution? No matter how many blocks you have stacked up, there is a way to organize the order of which the blocks