Magic is a technique which you don't know and things happens. If you know the technique then there is no magic. Broadly magic is used to make you fool.
We don't think and that happens is called Miracle. It is within or beyond our imagination but not in our control. Generally, Miracle is done by god. It is also done by humans but very very rare.
Example in respect to this post :
Magic: I wrote here and received the 2 SBD is magic.
Miracle : I wrote here and received the 5 SBD is miracle.
If nothing happens means No magic and No miracle.