Tons of changes, all of which I've forgotten. A number of refactors

exist. Nav menu partly operational on mobile.

src/partials/_pane_error.scss

@@ -1,15 +1,16 @@
 @use "a_tailer";
 
 .pane_error {
-    width: max-content;
+    grid-area: main;
 
-    margin: auto; /* center object */
+    width: max-content;
+    margin: auto;
 
     > .body,
     .tailer {
         background-color: var(--background-2);
         border-radius: var(--border-radius-leaf);
-        padding: var(--spacing-horizontal);
+        padding: var(--spacing-small);
 
         text-align: center;
     }
@@ -19,7 +20,7 @@
     .pane_error {
         width: 100%;
 
-        margin-top: var(--margin-pane);
-        margin-bottom: var(--margin-pane);
+        margin-top: var(--spacing-large);
+        margin-bottom: var(--spacing-large);
     }
 }