Index: wp-content/themes/twentynineteen/style-rtl.css
===================================================================
--- wp-content/themes/twentynineteen/style-rtl.css	(revision 54300)
+++ wp-content/themes/twentynineteen/style-rtl.css	(working copy)
@@ -5899,7 +5899,8 @@
 
 @media only screen and (min-width: 1168px) {
   .entry .entry-content .wp-block-image .aligncenter {
-    width: calc(6 * (100vw / 12) - 28px);
+    width:100%;
+    margin: 0 auto;
   }
   .entry .entry-content .wp-block-image .aligncenter img {
     margin: 0 auto;
Index: wp-content/themes/twentynineteen/style.css
===================================================================
--- wp-content/themes/twentynineteen/style.css	(revision 54300)
+++ wp-content/themes/twentynineteen/style.css	(working copy)
@@ -5911,7 +5911,8 @@
 
 @media only screen and (min-width: 1168px) {
   .entry .entry-content .wp-block-image .aligncenter {
-    width: calc(6 * (100vw / 12) - 28px);
+    width:100%;
+    margin: 0 auto;
   }
   .entry .entry-content .wp-block-image .aligncenter img {
     margin: 0 auto;