diff --git a/py/icalfilter/web/main.js b/py/icalfilter/web/main.js
index ec67f1ec43..e06d0e2b1a 100644
--- a/py/icalfilter/web/main.js
+++ b/py/icalfilter/web/main.js
@@ -16,6 +16,7 @@ document.addEventListener('DOMContentLoaded', () => {
       url: '/ical.ics',
       format: 'ics',
     },
+    height: '100%',
   });
   calendar.render();
 })