Added styling for active/missing tags for maintenance popup

src/styles/content/listing.scss

@@ -55,7 +55,19 @@
     }
 
     .tag {
+      cursor: pointer;
       padding: 0 6px;
+      user-select: none;
+
+      &:hover {
+        background: colors.$tag-text;
+        color: colors.$tag-background;
+      }
+
+      &.is-missing:not(.is-added),
+      &.is-present.is-removed {
+        opacity: 0.5;
+      }
     }
   }