Height percentage not working in CSS

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When you are using % for width, or height, the 1st question you should ask is that 80% of what? So you also need to apply height to the parent element, so assuming that this element of yours is inside the body tag, you need to use this in your CSS

html, body {
   height: 100%;
}

So now your div element will be 80% of 100%

Demo

Side Note: Also when you are dealing with absolute positioned elements, you may come across a scenario where your div won’t exceed the current viewport height, so in that case you need to have min-height

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