CSS customization in Editor
Some things you can do
Change appearence more freely.
Add transition and animation effects.
Guidelines
Changes to both css and event scripts are not applied to campaign inside the Campaign Designer, they only apply to the live campaign and preview. To see the changes you need to either preview the campaign or publish it.
Try to find specific selectors, if you style div { background-color: red } all divs in the widget will have a red background.
You might need to set !important for the change to take effect.
button selectors:
form selector:
canvas selector: