The text area of Dummy JSON should be able to resize

[formulahendry]

The text area of Dummy JSON should be able to resize

[jxtxzzw]

Fixed, and here is the update:

Now the text area can be resized if user inputs too many lines, or can be resized if use drags the bounderies of the text area.

But in order not to cause the strange UI, I set the default min-height as the height of 10 rows, just as what is done by GitHub comment editor.