Remove button background and leave only the icon

[GeorgiAngelov]

I am trying to use an icon, instead of the circles, for the floating button.

• I tried setting the "src" property but that resulted in the icon being ontop of a circle.
• I then treid to set the "fab:fab_icon" icon property but that resulted in my image being enclosed in a circle with a color.

How can I just use the plain icon instead of adding any background circles behind it ? This seems like a pretty important feature to have.