When sheets are superimposed as layers in the browser window, some elements may block out others, depending on their order in the stack.

Question

Quizplus · Accepted Answer

This is because elements that appear later in the HTML code and/or are positioned higher in the CSS z-index will be "on top" of elements that appear earlier or have a lower z-index, which can result in certain elements being blocked or hidden by others.

When Sheets Are Superimposed as Layers in the Browser Window