Home Web Front-end CSS Tutorial How Can I Make a Child Div Stretch to the Height of Its Parent with Unknown Height?

How Can I Make a Child Div Stretch to the Height of Its Parent with Unknown Height?

Dec 18, 2024 am 02:54 AM

How Can I Make a Child Div Stretch to the Height of Its Parent with Unknown Height?

Stretching Child Divs to Match Parent Height

When you encounter a situation like the one described, where the height of a child div should match that of its parent but the parent's height is unknown, a solution can be found through flexbox.

To achieve vertical scaling of the child div, the parent element requires the following style:

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display: flex;

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Additionally, you should add browser prefixes to ensure cross-browser compatibility.

The align-items: stretch; property is also crucial. However, since it is the default value for align-items in flex boxes, you do not need to set it explicitly unless you intend to use a different value.

Flexbox's align-items property affects child elements, not the element it is applied to. To define stretching for child elements, you can use the align-self property.

Consider the following example:

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.parent {

  background: red;

  padding: 10px;

  display:flex;

}

 

.other-child {

  width: 100px;

  background: yellow;

  height: 150px;

  padding: .5rem;

}

 

.child { 

  width: 100px;

  background: blue;

}

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<div class="parent">

  <div class="other-child">

    Only used for stretching the parent

  </div>

  <div class="child"></div>

</div>

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In this example, the other-child div exists solely for the purpose of stretching the parent's height. As a result, the child div will occupy 100% of the parent's adjustable height.

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