Saw it on this page, copied the css but didn't test if this works…

http://www.sintjan.com/grootste-museum-van-nederland/

/* -- START Bounce full width header scroll icon -- */
span.scroll-down.et-pb-icon {
-webkit-animation: ca3_fade_move_down 2s ease-in-out infinite;
-moz-animation: ca3_fade_move_down 2s ease-in-out infinite;
animation: ca3_fade_move_down 2s ease-in-out infinite;
}
/* -- END Bounce full width header scroll icon -- */
Code language: CSS (css)