Change the basic color of the submit button:

Change the color of the submit button when hovered:

Turn the submit button into a gradient background with hover effect:

Add a Pulse or Glow on hover:

Add emoji next to the submit button text:

Add a Gradient that also lifts the submit button on hover with left-arrow icon:

Add Glassmorphism and Glow effect on the submit button:

Add a solid color that shimmers the submit button, and also lift it up a little:

Add an outline to the submit button that also fills a color that glows:

Transforms the submit button into a bold-CTA like style: