Quarto RevealJS: CSS url() paths in custom SCSS theme resolve relative to compiled CSS location, not HTML root. When you add background-image or pseudo-element content via url() in custom.scss for a Q
Quarto RevealJS: adding a second `::before` or `::after` pseudo-element on `.reveal .slides` silently overrides existing decorative elements (e.g., frame rules, ornamental bars) because CSS only allow