diff --git a/src/index.css b/src/index.css
index 36ac8167..6fc98cb2 100644
--- a/src/index.css
+++ b/src/index.css
@@ -492,12 +492,24 @@ body.mobile-sidebar-open {
   text-align: center;
   padding: 3rem;
   color: #888;
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
 }
 
 .empty-state p {
   margin: 0.5rem 0;
 }
 
+.loading {
+  flex: 1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
 .bookmarks-list {
   display: flex;
   flex-direction: column;
@@ -618,6 +630,13 @@ body.mobile-sidebar-open {
     height: 100%;
   }
   
+  /* Remove borders from containers in mobile overlays */
+  .pane.sidebar .bookmarks-container,
+  .pane.highlights .highlights-container {
+    border: none;
+    border-radius: 0;
+  }
+  
   /* Bookmarks sidebar from left */
   .pane.sidebar {
     left: 0;