This has nothing to do with your model, what you need to do is change the CSS for this element. Many of the Rails engines tend to βhideβ css from you, but it is often better to leave them alone and make changes to your own custom.css file (or custom.css.scss if you use SASS).
The easiest way is to look at the page in Chrome, right-click on the body element and when the pop-up menu appears, go to the Inspect Element item. The Chrome Developer Tools window opens and this item is highlighted. Look at the css class on the right to see what is called.
Go to your custom.css file and write a new version of this css class. You can use this exact name, but it's better to write your own class that is added to this particular html element, or you will redefine more than you want.
input, textarea .yourclassname { height: 200px; }
If something like this does not work. Add it! Important. (Better to leave it if you don't need it.)
input, textarea .yourclassname { height: 200px !important; }
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