When using Safari v14.0 on macOS 10.15.6 (and probably on Big Sur/11 too) the Zoom OAuth screen captcha is stretched hugely which makes it unreadable and hence prevents sign-in.
This is seemingly because the
.zm-captcha-img captcha image CSS specifies
height: 100% and
max-height: 100% but the CSS for containing DIVs (for example
.zm-captcha--small) do not currently specify
Either replace the image’s CSS with a fixed
max-height OR apply a fixed
max-height to one of its parent DIVs.
It would be great if this could be prioritised because it’s presumably preventing up-to-date Mac users from using OAuth to sign in to any Zoom marketplace app right now!!