diff --git a/wp-content/themes/twentythirteen/style.css b/wp-content/themes/twentythirteen/style.css
index 09450e575a..8c96b3e36d 100644
--- a/wp-content/themes/twentythirteen/style.css
+++ b/wp-content/themes/twentythirteen/style.css
@@ -2359,7 +2359,8 @@ footer.entry-meta {
 }
 
 #commentform input[type="text"] {
-	width: 270px;
+	max-width: 270px;
+	width: 60%;
 }
 
 #commentform textarea {
@@ -3007,6 +3008,11 @@ footer.entry-meta {
 		width:         calc(100% - 104px);
 	}
 
+	#commentform input[type="text"] {
+		width: -webkit-calc(100% - 100px);
+		width:         calc(100% - 100px);
+	}
+
 	#commentform textarea {
 		height: 80px; /* Smaller field for mobile. */
 	}