diff --git a/public_html/media/css/comment-edit.css b/public_html/media/css/comment-edit.css
index 9baef1ba..ab82c989 100644
--- a/public_html/media/css/comment-edit.css
+++ b/public_html/media/css/comment-edit.css
@@ -9,4 +9,5 @@ form.edit-comment textarea,
form.add-comment textarea {
width: 50em;
height: 8em;
+ box-sizing: border-box;
}