[Mike0]

For cut off icons I'd recommend just editing the sprite png file manually in a graphics editor.
While you're at it, try saving it in 8-bit color format with alpha channel (transparency). Not many editors support saving in that format (but browsers display it properly), so you can use https://tinypng.com/ for example. That can reduce the sprite size by more 50%. Just make sure to compare the result image with the original to see if there's a noticeable difference.