diff --git a/style/spreadquiz.css b/style/spreadquiz.css
index 838f512..4447396 100644
--- a/style/spreadquiz.css
+++ b/style/spreadquiz.css
@@ -130,6 +130,7 @@ section.window-inner {
     background-color: whitesmoke;
     padding: 1em;
     width: fit-content;
+    max-height: calc(100% - 2em);
 }
 
 /* ----- */