AHHHH THANK YOU! HERE THE CODE THAT I USE:

body:before { content: " "; display: block; position: fixed; top: 0; left: 0; bottom: 0; right: 0; background: linear-gradient(rgb(55 55 55 / 40%) 35%, rgb(0 0 0 / 5%) 70%); z-index: 99999; background-size: 100% 2px, 3px 100%; pointer-events: none }

body:after { content: ''; position: fixed; bottom: 0px; right: 37px; width: 72px; height: 230px; background-image: url(link); background-size: contain; background-repeat: no-repeat; z-index: 200; pointer-events: none; }