diff --git a/theme/assets/css/main.css b/theme/assets/css/main.css
index 8b325df..b514e9e 100644
--- a/theme/assets/css/main.css
+++ b/theme/assets/css/main.css
@@ -491,7 +491,11 @@ p:last-child { margin-bottom: 0; }
     top: 0; left: 0; right: 0; bottom: 0;
     background: var(--color-dark);
     z-index: 99;
+    overflow: hidden;
+  }
+  .site-nav.open .nav-menu {
     padding: 5rem 2rem 2rem;
+    height: 100vh;
     overflow-y: auto;
     -webkit-overflow-scrolling: touch;
   }