Offset color block looks great on desktop but not on mobile

Site URL: https://power-moves-template.squarespace.com/

I've used the following code to create an offset color border of an image block. It looks great on desktop but not on mobile. Can someone help?

/* add offset border around image on home page */

#block-66c587f6c414c7cc6834 {box-shadow: -20px -20px #834a20; padding: 0px 0px 0px 0px;}

Password: demo

Use this new code

/* add offset border around image on home page */
#block-66c587f6c414c7cc6834 {
  box-shadow: -20px -20px #834a20; 
  padding: 0px 0px 0px 0px;
	padding-top: 0px !important;
}