diff --git a/gen.html b/gen.html
index 39a186b..7c64ba5 100644
--- a/gen.html
+++ b/gen.html
@@ -34,6 +34,9 @@
   }
   </script>
   <style>
+  html, body {
+    height: 95%;
+  }
   div.main {
     padding:20px;
     height: 100%;