How to say this in japanese?

Question:

How to say 'superficial beauty' or 'surface beauty'...

in the context like, the beauty that it's in surface but inside to be a bad person?

Superficial beauty?

Answer:

うわべだけの美しさ
見かけだけの美しさ
見た目だけの美しさ

Any one of those you can pick.