diff --git a/public/s/css/f0ck.css b/public/s/css/f0ck.css
index ed89d38..a792f3a 100644
--- a/public/s/css/f0ck.css
+++ b/public/s/css/f0ck.css
@@ -3015,4 +3015,17 @@ input#s_avatar {
 
 #s_avatar:hover {
   background: #ffffff0f;
+}
+
+/* nav ↓ (mobile) */ 
+@media (max-width: 768px) {
+body {
+  display: grid;
+}
+
+.navbar.navbar-expand-lg {
+  grid-row-start: 2;
+  position: sticky;
+  bottom: 0;
+}
 }
\ No newline at end of file