CSS: Dynamically adjusting height based on parent element's current height

I'm seeking clarification on the topic at hand. Why am I unable to simply use the following code:

<div style="min-height: 100vh">
    <div style="height: 100%">
    </div>
</div>

When I implement this code, the second div does not expand to fill 100% of the first one.

Answer №1

Simply swap out "min-height" for height.

<div style="height: 100vh">
    <div style="height: 100%">
    </div>
</div>

Answer №2

Here's a different approach to achieving your objective by utilizing flexbox.

This...

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

... sets a baseline for all elements, eliminating the default margins that come with the <body> tag and preventing vertical scrolling.

This...

html, body {
  height: 100%;
}

... establishes the required height that will extend to child elements, enabling them to reach full height as well.

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

.outerDiv {
  display: flex;
  height: 100%;
  border: 4px solid red;
}

.innerDiv {
  height: 100%;
  width: 100%;
  border: 4px solid blue;
}
<div class="outerDiv">
  <div class="innerDiv">
    test
  </div>
</div>

Answer №3

Change the CSS property from min-height to height within the initial div element

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