Easiest Tutorial to Change Width of Text Field in Gravity Forms. https://wordpress.org/plugins/styles-and-layouts-for-gravity-forms/ (Styles & Layouts FREE plugin)
http://wpmonks.com/downloads/addon-bundle/ (Styles & Layouts Pro Addons)
Checkout the above URLs to Insert Width of Text Fiels in Gravity Forms
Styles and Layouts for Gravity Forms is unique Wp addon to tailor-make the design of Gravity Forms. You are not required to insert customized CSS codes within your theme files to style forms. .
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