Hi,
I’ve ran into the same issue & found what was the problem is.
If you copied the sprite.svg file that mosh have provided then you are good to go.
But, if you have generated the sprite.svg file as mosh told you by yourself, the syntax of your sprite.svg file would be different from moshes sprite.svg file.
So just search for id="snap"
(you can use CTR+F to look it up in your file) & then there is an inline styles fill="rgb(0,0,0)"
that you nedd to get rid of and the problem got solved.