Jot Form styling

Hi all,
Maybe it’s me just being dim but I cannot seem to find a way to change the css for Jot.
I am using the version that came with my Modx - 1.1.4. I have created the right calls and it all works fine on my site, but I need to resize the comment boxes as they are to wide. I am new to coding and would a ppreciate a broken-down answer, lol. Any help appreciated

You can find the file you need to modify here: assets/snippets/jot/templates/jot.css

Thank oyu. Sorry I should be more specific. I understand the file I need to change, but not sure which line to adjust. I have tried adding ’width: 350px;’ but have not got anywhere, help!