flex: 2 1 auto; some content, no width.

flex: 1 1 auto; Even more content than before, but no width explicitly set.

flex: 3 1 auto; Lots and lots of content. Even more content than to the left, but no width explicitly set.

flex: 2 1 0%; some content, no width.

flex: 1 1 0%; Even more content than before, but no width explicitly set.

flex: 3 1 0%; Lots and lots of content. Even more content than to the left, but no width explicitly set.