diff --git a/ext/bg/css/pitch-accents-preview.css b/ext/bg/css/pitch-accents-preview.css
index 75a3a08b..339ca9f5 100644
--- a/ext/bg/css/pitch-accents-preview.css
+++ b/ext/bg/css/pitch-accents-preview.css
@@ -53,4 +53,5 @@ li {
     max-width: 100%;
     width: 700px;
     flex: 0 0 auto;
+    height: auto;
 }