hii anon!! just put this in your custom css section. I've seen some people claim for this code to be theirs or request credit but it is something that's been going around spacehey/other sites for years before neospring so use to your hearts content lolol

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