With Style Tags...
Include style tags directly in embedded HTML to style HTML elements:
With an External CSS File...
Create a CSS file
Choose File ▶ New ▶ CSS to create a new CSS file:
Define styles in the CSS file
Add style directives to the CSS file:
Use the CSS file in embedded HTML
Link to the CSS file in a cloud-deployed HTML fragment to use its styles:
Verify your styling
Click the URL of the deployed object to visit it: