Square Division, width set to match 100% of the height

I have been attempting to create a square shape that is responsive, with the width determined by the height of the element (100%). I personally think achieving this using CSS alone is not possible.

The goal is for the square's width to match its height (which is 100% of the larger container's height, exceeding 100% of the screen size). This ratio must be maintained to retain the square shape.

Answer №1

One way to achieve this is by incorporating a small inline image without the need for JavaScript or additional files.

.container {
  height: 150px;
  width: 100%;
  text-align: center;
  background: #acd;
}
    
.square {
  display: inline-block;
  height: 100%;
  background: #691;
}
<div class="container">
  <div class="square">
    <img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" height="100%">
  </div>
</div>

Answer №2

Have a look at the aspect-ratio property to understand how it works.

This property simplifies the process of creating a square div based on height. Below is an example code snippet:

h2 {
  font-family: calibri;
}

#parent {
  height: 96px;
  width: 256px;
  background: grey;
  margin-bottom: 16px;
}

#child {
  height: 80px;
  aspect-ratio: 1 / 1;
  background: lightgrey;
}

#anotherParent {
  height: 96px;
  width: 256px;
  background: grey;
}

#anotherChild {
  height: 50%;
  aspect-ratio: 1 / 1;
  background: lightgrey;
}
<h2>Absolute height (80px/96px)</h2>
<div id="parent">
  <div id="child">
  </div>
</div>

<h2>Relative height (50%)</h2>
<div id="anotherParent">
  <div id="anotherChild">
  </div>
</div>

For more information about the aspect-ratio property, check out these helpful links:

Answer №3

If you're looking for a CSS-only solution to size elements relative to the screen, consider using viewport units. Here's an example:

@media screen and (orientation:landscape) {
    .box{
        height: 100vh;
        width: 100vh;
    }
}
@media screen and (orientation:portrait) {
    .box{
        height: 100vw;
        width: 100vw;
    }
}

(You may want to reduce it slightly to eliminate scrolling)

This technique works well for divs that need to take up a specific proportion of screen space.

View the JSFiddle example here.

Answer №4

Given that a square has equal width and height, you can easily set the height based on the known width of the square.

If you have access to JavaScript, you might want to consider using this handy jQuery code snippet:

var wiDth = $('div').css('width'); // retrieve width
$('div').css('height', wiDth); // set the height to match the width

Feel free to experiment with it yourself at: http://jsfiddle.net/afzaal_ahmad_zeeshan/vpGUK/

Answer №5

If you're looking to achieve this effect using JavaScript, the setup involves having a larger container div with a square element inside that matches its height. Here's the HTML structure:

<div id="container">
  <div id="square" style="height:100%;">
  
  </div>
</div>

To implement this in JavaScript, you can use the following code:

<script>
  var container = document.getElementById("container");
  var square = document.getElementById("square");

  square.style.width = container.style.height;

  window.onresize=function(){
    square.style.width = container.style.height;
  };
<script>

I hope this solution works for you!

Answer №6

Check out this amazing 'css only' solution that I believe will work great for your needs. It is compatible across different browsers.

This article emphasizes an interesting css rule:

If you specify vertical paddings (and margins) in percent (%) values, the size will be a percentage of the width of the containing element.

Answer №7

Embed this code in your website:

<script src="http://code.jquery.com/jquery-1.10.2.js"></script>
and experiment with jQuery:

let containerHeight = 0;
$("#yourContainer").children().each(function(){ 
    containerHeight += $(this).height;  
});
$("#yourContainer").css('width', containerHeight + 'px');

Answer №8

Here is the solution to your problem:

<div id="square" style="background-color:black;height:100%">test</div>

$(window).ready(updateWidth);
$(window).resize(updateWidth);

function updateWidth()
{
var square = $('#square');
var size = square.height();

square.css('width',size);
}

Check out this jsFiddle link for a demo.

Answer №9

To create a square div with 100% height and width, simply assign the desired values to the container.

.container {
    width: 100%;
    height: 100%;
}

This will ensure that the div maintains a perfect square shape with equal height and width dimensions.

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