What is the best way to set the width of an inner element as a percentage of the Body's width?

Applying a percentage width to any inner element of a page will typically result in that element taking a percentage of its parent container's width.

Is there a way to specify the width of an inner element as a percentage of the overall Body width, rather than the default behavior?

Extra Details: The Body width can vary depending on the device. If the device width is above 1440px, the Body width will be set at 1440px; for smaller devices, the Body width will be set to 100%.

Answer №1

It's not recommended to customize your <body>.

Instead, create a container using a combination of viewport units and max-width.

.container {
  width: 100vw;
  max-width: 1440px;
  height: 100vh;
  margin: 0 auto;
  background-color: green;
}
<div class="container"></div>

Answer №2

One way to achieve responsive design is by utilizing viewport units.

<div class="container"> /** Width:900px;  **/
      <div class="box"> /** 100% of BODY, not of parent div **/

      </div>
   </div>

<style>
.container {
background-color: blue;
width:30%;
padding: 20px;
}


.box {
background-color: yellow;
width: 100vw;
}
</style>

Alternatively,

You can determine the width of the body using JavaScript and assign a percentage of that width to other elements.

Get body width:

document.body.clientWidth;

Assign width to HTML element:

document.getElementById('element_id').setAttribute("style","width:500px");

Answer №3

To ensure that an element's width always matches the width of the body, you can utilize viewport units.

For example, 1vw corresponds to 1% of the width of the viewport's initial containing block, typically the body itself.

If you aim for something to occupy 20% of the body's width, you simply need to set its width to width: 20vw.

This approach remains consistent regardless of how deeply nested the element is within the DOM, as it adjusts proportionally to the screen size at the time of page load.

For further insights on viewport units, check out: https://css-tricks.com/fun-viewport-units/

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