[FIX] Add min-height to the textarea

[AlanLes]

Describe the bug

One of our testers found that when resizing the textarea in our product, the user can make the textarea control extremely thin. Let's add some CSS min-height to the textarea for those cases.

To Reproduce

Steps to reproduce the behavior:

1. Go to '...'
2. Resize the control to make it thinner.
3. Optionally type something into the textarea.
4. See that the placeholder or text (if you entered something in 3.) is outside of the control (like on the screenshot below)

Expected behavior

The textarea's content shouldn't stick out of the control's content.

Screenshots