I could give you some tips!
To make things transparent
1: Find opacity
2: Set the number whatever you want!
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0.5: Transparent
0: Invisible
1: Opaque
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Tutorial to make an button to other card!
1: Add rules on a blueprint
2: Pick "When this is tapped"
3: Then response should be "Send player to different card"
4: Pick the card you want to be teleported to
5: Now test and tap the button
If it works enjoy your game!