1. Custom CSS
Inside your Grid’s main settings page, click the “Skins” tab, and then click the “Selected Skin” button to see which skin your Grid is using.
Next, from the Item Skin Editor find your skin and click the “Edit” button.
Then click the “Edit CSS” button found toward the top right of the page:
Finally, add your custom CSS and save.
Then once the CSS popup window closes, click the green “Save” icon found directly below the “Custom CSS” button icon: