diff --git a/zephyr/static/js/ui.js b/zephyr/static/js/ui.js
index d2dad80e39..d2d7507cba 100644
--- a/zephyr/static/js/ui.js
+++ b/zephyr/static/js/ui.js
@@ -134,6 +134,7 @@ function resizehandler(e) {
     }
 
     $("#bottom_whitespace").height($(window).height() * 0.4);
+    $("#main_div").css('min-height', viewport.height());
 
     // This function might run onReady (if we're in a narrow window),
     // but before we've loaded in the messages; in that case, don't