Styling with CSS using the em unit to make an image half the size of its parent div element

I'm struggling with resizing an image within a div using the em size unit. I want the image to be half the size of its parent div, so I set both the width and height CSS properties of the image to 0.5em.

However, when looking at the code below, you can see that the result is not what I expected!

<div>
   <img src=''>
</div>

html {
   font-size:16px;    
}

div {
   width: 20em;
   height: 20em;
   border: 1px solid red;
}

img {
   border: 1px solid green;
   width: 0.5em;
   height: 0.5em;
}

Fiddle: http://jsfiddle.net/framj00/pz27X/1/

Could someone please assist me in resolving this issue?

htmlcssfont-size

Answer №1

em units are commonly used for proportional measurements in CSS. When using em, the size will be relative to the root font size, which is typically set to html { font-size: 16px; }. For example, setting width: 0.5em; height: 0.5em would result in a size of 8px.

If you want an image to be 50% of the size of its parent <div>, using em as a measurement won't work. Instead, you should use %:

img {
  border: 1px solid green;
  width: 50%; /* equivalent to width: 0.5em */
  height: 50%; /* equivalent to height: 0.5em */
}

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