Fix mobile

src/components/home/Hero.astro

@@ -48,7 +48,7 @@ const ui = t(lang);
     align-items: flex-end;
     /* Runs up under the floating header so the glass bar sits on the image, fills the screen,
        and is never less than the headline needs. */
-    margin-top: calc(-1 * var(--header-height));
+    margin-top: calc(-1 * var(--header-offset));
     min-height: max(28rem, 100svh);
     overflow: hidden;
   }