i honestly don't know why this was working without this but i'm adding it just in case

eleventy.config.js

@@ -1,3 +1,4 @@
+import { HtmlBasePlugin } from "@11ty/eleventy";
 import { eleventyImageTransformPlugin } from "@11ty/eleventy-img";
 import eleventyNavigationPlugin from "@11ty/eleventy-navigation";
 import { feedPlugin } from "@11ty/eleventy-plugin-rss";
@@ -107,6 +108,9 @@ export default async function(eleventyConfig) {
 		}
 	});
 
+	/* HTML base */
+	eleventyConfig.addPlugin(HtmlBasePlugin);
+
 	/* Images */
 	eleventyConfig.addPlugin(eleventyImageTransformPlugin, {
 		// output image formats