Transparent colours dont work

I recently tried making slime blocks blue and when I apply them to my nova resource pack or a zip file, they come out full coloured so you can’t see their inside.
http://minecraft.novaskin.me/skin/1487573444/Slime-Block-Blue-v2

This is the skin that I made and you can cleary see in this it is transparent. When applied to game, it turns into this:
https://gyazo.com/2a89bdc881b270efb7127f3b8821a5dd

Could someone help me out please.

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