The ideal way to handle this is outside of Webflow.
In Photoshop/Pixlr, create a square canvas template (say 1000x1000px) then position/scale each icon inside of this square canvas. This will keep the image size the same for all icons and you’re controlling the proportion before going into Webflow.
There is a way to do it in Webflow, but as you can see the teeth image has a lot of blank area above and below the actual line art. So each image will need a unique class to control the sizes.
Many ways to handle it. I prefer to use minimal styling when possible. I’ve attached two screen grabs. I’m using the single tooth icon to represent all icons since it’s a perfect square image. (Imagine the other two icons being inside of the same 512x512px png format)
I’m controlling the size and position of the icon using properties from the “grey icon wrapper” element. Applied 50px of padding on all sides. Added 25px margin on the bottom.