How can I change the text size, color, and font style on a button?

1. In the editor, click on the button element on the canvas to load the sidebar settings.
2. On the [button text] field on the settings, add this code:

<span style="font-size:20px; color:red !important;">TEXT HERE </span>

• just substitute red to any color or hexadecimal color
• and edit the text