diff --git a/phpBB/styles/prosilver/theme/forms.css b/phpBB/styles/prosilver/theme/forms.css
index 755ce4a19d..64d2df2d1a 100644
--- a/phpBB/styles/prosilver/theme/forms.css
+++ b/phpBB/styles/prosilver/theme/forms.css
@@ -256,6 +256,7 @@ fieldset.submit-buttons input {
 	min-width: 100%;
 	max-width: 100%;
 	font-size: 1.2em;
+	resize: vertical;
 }
 
 /* Emoticons panel */