Hi @juliemadermeersman,

Usually, the size of the SVG is selected when the SVG is created and as such is not needed to be specified.

Having said that, you can change the size of it though just by selecting the img and changing its width or height, again like you could a PNG or JPG.

Let’s say you have an image like so:

<img src="DigitalOcean.svg" alt="DigitalOcean SVG">

if you want to add height or width to is you can simply transform it to:

<img src="DigitalOcean.svg" alt="DigitalOcean SVG"width="500" height="600"> 

Now, if you want to add them as a class, you can do the following

<a href="/" class="logo">
  DigitalOcean
</a>

.logo {
  display: block;
  text-indent: -9999px;
  width: 100px;
  height: 82px;
  background: url(DigitalOcean.svg);
  background-size: 100px 82px;
}

Hope this helps!
Regards,
KFSys