Varia: Make sure centre aligned image is centred

varia/sass/blocks/utilities/_style.scss

@@ -24,6 +24,8 @@
 .aligncenter {
 	clear: both;
 	float: none;
+	margin-right: auto;
+	margin-left: auto;
 	text-align: center;
 }
 

varia/style-rtl.css

@@ -2018,6 +2018,8 @@ table th,
 .aligncenter {
 	clear: both;
 	float: none;
+	margin-left: auto;
+	margin-right: auto;
 	text-align: center;
 }
 

varia/style.css

@@ -2021,6 +2021,8 @@ table th,
 .aligncenter {
 	clear: both;
 	float: none;
+	margin-right: auto;
+	margin-left: auto;
 	text-align: center;
 }