どんな本でも

any book

→ どんな
phrase Rare #41,404
any book どんな本でも means “any book” or “any kind of book.” The pattern どんな + noun + でも expresses that the choice does not matter.
JA: どんな本でも好きなものを選んでください。
EN: Please choose any book you like.

どんな本でもいつでも買って読めます

You can buy and read any book at any time.

君の読みたいどんな本でも読んでよい

You may read any book you want.

おもしろいならどんな本でもよい

Any book is fine as long as it's interesting.