This article will show you how to add Advanced Styling options using custom CSS for your Apps and Forms.
Important Note
Styling can also be added at the Environment level.
Instructions
Navigate to Apps and click Manage next to the app you want to edit
Select the Developer Tools tab
Click on the Advanced Styling box
Input your CSS code in the editor box
Note: To see the class references, select the CSS Reference Guide button
Scroll up and click Save
Click Open App on the My Apps screen to view your code