diff --git a/mod/assign/feedback/editpdf/styles.css b/mod/assign/feedback/editpdf/styles.css
index 4c0fb56659a..6e22ae779a2 100644
--- a/mod/assign/feedback/editpdf/styles.css
+++ b/mod/assign/feedback/editpdf/styles.css
@@ -229,6 +229,7 @@
     margin-right: 0;
     margin-top: 0;
     border-radius: 4px;
+    width: 30px;
 }
 
 .moodle-dialogue-base .moodle-dialogue.assignfeedback_editpdf_dropdown .moodle-dialogue-bd {