title: How to change the size of FloatingActionButton?
body: <p>I'm trying to set a size to a <code>FloatingActionButton</code> in flutter, I wanna set <code>width</code>/<code>height</code>, I mean, make the button bigger, I was looking for a circular button, but the only one that I got was this one, so, I started to work with this, but I need it a little bigger.</p>