diff --git a/app/assets/stylesheets/common/main_layout.scss b/app/assets/stylesheets/common/main_layout.scss
index 418497f1d..1beb767fc 100644
--- a/app/assets/stylesheets/common/main_layout.scss
+++ b/app/assets/stylesheets/common/main_layout.scss
@@ -39,7 +39,9 @@ div#page {
 
     input[type=text] {
       width: 10em;
-      z-index: 1000;
+
+      /* ensure expanded search box renders above post thumbnails. */
+      z-index: 1;
       position: relative;
     }
   }