In order to add such effect to your page, please choose a page element (icon, title, text, image, etc.) and in the widget’s settings identify this page element as a Starting point. Specify the rest parameters, like ID, background effect, background color, delay, etс. Now you need to find another page element and identify it as an End point.
The effect begins when your starting breakpoint becomes visible in the window and lasts till the end breakpoint reaches the visible area of the window. The starting and end breakpoints should have the same ID to make a “pair”.