Added clarifying comment

andromeda.css

@@ -15,6 +15,7 @@
 /* ============================== */
 /*  Global
 /* ============================== */
+/* Enable rem to match media queries */
 html {
     font-size: unset !important;
 }
@@ -28,14 +29,18 @@ body {
     .skinHeader {
         --background-width: 100rem;
     }
+}
+@media (min-width: 100em) {
+    /* Set graphic to width of screen */
+    .skinHeader {
+        --background-width: 100%;
+    }
     /* Push content down from under graphic */
     div.skinBody > div.page {
         padding-top: 15rem !important;
     }
 }
 .skinHeader {
-    /* Set graphic to width of screen */
-    --background-width: 100%;
     /* Position graphic behind header */
     margin-top: calc(-1 * (0.2202 * var(--background-width)));
     height: 100%;