diff --git a/static/panel.css b/static/panel.css
index 2c13d75..ff51df5 100644
--- a/static/panel.css
+++ b/static/panel.css
@@ -17,6 +17,11 @@
 
 * { box-sizing: border-box; }
 
+/* Must beat every display rule below it. `hidden` is a plain UA style, so
+   any author rule -- .sheet-wrap's display:flex, say -- silently wins, and
+   an overlay that never hides sits over the whole panel eating taps. */
+[hidden] { display: none !important; }
+
 html { background: var(--bg); }
 
 body {