diff --git a/lib/sidebar.js b/lib/sidebar.js
index 5092079..ad1521d 100644
--- a/lib/sidebar.js
+++ b/lib/sidebar.js
@@ -22,7 +22,7 @@ define([], function () {
       if (sidebar.classList.contains("hidden"))
           return 0
 
-      var small = window.matchMedia("(max-width: 60em)")
+      var small = window.matchMedia("(max-width: 630pt)")
       return small.matches ? 0 : sidebar.offsetWidth
     }
 
diff --git a/scss/main.scss b/scss/main.scss
index 6cb3bbf..59c0bec 100644
--- a/scss/main.scss
+++ b/scss/main.scss
@@ -3,9 +3,9 @@
 @import '_leaflet';
 @import '_leaflet.label';
 
-$minscreenwidth: 60em;
+$minscreenwidth: 630pt;
 $sidebarwidth: 420pt;
-$sidebarwidthsmall: 360pt;
+$sidebarwidthsmall: 320pt;
 $buttondistance: 12pt;
 
 @import '_sidebar';