Buttons in pre-designed blocks now support icons. To add one, go to the Content tab and under Button Title click "Select icon."
In the pop-up widget, you can: Choose an arrow that by default matches the text color; browse Tilda Icons and Noun Project; pick an emoji; or upload an image. You can also select a different icon that appears on hover.
In the Settings tab, adjust the icon's position—left or right of the button label—as well as its size and padding. You can now also customize the button's internal padding. For example, set vertical padding to 16px and horizontal padding to 24px.