Add an animated gradient color style to the header button. This plugin uses css editor and works with Squarespace 7.1.

From your Squarespace account, go to the Custom CSS Editor. Copy and paste the code below into the Custom CSS Editor box.

This plugin helps targets both the desktop header button, as well as the mobile menu button.

Change the background color values to the colors of your choice. Be sure to set the button style to solid in button settings. Do not change any of the values in the Animation Keyframes.