z-index not indexing properly

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Alright, so this code generates two blocks in a div. The top block should go over the bottom block because the top has a higher z-index, but when I give the bottom block a margin-top: -30px it goes above the top block.

<div style="width: 300px; height: 90px; overflow: hidden;">
  <div style="width:300px; height: 50px; z-index: 2; background-color: #ff0000;">
  <div style="width:300px; height: 50px; z-index: 1; background-color: #ff00ff; margin-top: -30px;">

How do I get the top block to go above the bottom block?


The z-index property only applies to positioned elements.

You could add position: relative and it will work as expected (example).

The default value of the position property is static, which is why it wasn’t working.