Clean up. New ability to save the session search text.

src/app.postcss

@@ -336,4 +336,29 @@ img.qr_code:focus {
 .dim {
     opacity: 0.5;
     color: hsla(0, 0%, 50%, .95);
-}
+}
+
+
+@media (max-width: 767px) {
+    .sk_header.hide_sm {
+        display: none;
+    }
+    .sk_header.show_sm {
+        display: initial;
+    }
+    .sk_header.show_md {
+        display: none;
+    }
+}
+
+@media (min-width: 768px) {
+    .sk_header.hide_md {
+        display: none;
+    }
+    .sk_header.show_md {
+        display: initial;
+    }
+    .sk_header.show_sm {
+        display: none;
+    }
+}