Round images usually look weird when they're included in a card with a small border-radius.

Use the simple rule of thumb:

𝙊𝙪𝙩𝙚𝙧 𝙍𝙖𝙙𝙞𝙪𝙨 = 2 * 𝙄𝙣𝙣𝙚𝙧 𝙍𝙖𝙙𝙞𝙪𝙨

• The precise formula is more complicated since you need to take into account the spacing between the two borders, so let's it simple!