[pref] Fix CSS textarea issue whereby the signature box was too small… #3642
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![image](https://user-images.githubusercontent.com/115112/31666236-70b53fba-b343-11e7-9517-230eacf4f294.png)
After:
![image](https://user-images.githubusercontent.com/115112/31666297-997ba02e-b343-11e7-9ed3-ee84f8c4bf99.png)