Fixes as suggested by Chris. Thanks.

Author: CartBlanche

website/.config/eleventy.config.collections.js

@@ -3,11 +3,13 @@
 const blogPosts = require('./collections/blogPosts');
 const blogTags = require('./collections/blogTags');
 const gameTags = require('./collections/gameTags');
+const resourceTags = require('./collections/resourceTags');
 
 
 /** @param {import("@11ty/eleventy").UserConfig} config */
 module.exports = function (config) {
     config.addCollection('blogPosts', blogPosts);
     config.addCollection('blogTags', blogTags);
     config.addCollection('gameTags', gameTags);
+    config.addCollection('resourceTags', resourceTags);
 }

website/content/resources.njk

@@ -26,7 +26,7 @@ permalink: resources/{{ (category | slugify) if category !== "all" }}/
                     <a class="mg-no-link hide-external-icon resource-item" href="{{ resource.url }}" title="{{ resource.title }}">
                         <div class="mg-card mg-box-shadow d-flex flex-column">
                             <div class="mg-card-thumbnail"
-                                 style="background-image: url('{{ resource.cover }}');
+                                 style="background-image: url('{{ resource.cover }}');">
                             </div>
                             by {{ resource.author }}
                         </div>