Index: src/wp-content/themes/twentyfifteen/css/editor-style.css
===================================================================
--- src/wp-content/themes/twentyfifteen/css/editor-style.css	(revision 29900)
+++ src/wp-content/themes/twentyfifteen/css/editor-style.css	(working copy)
@@ -32,11 +32,17 @@
 	font-family: "Noto Serif", sans-serif;
 	font-weight: 400;
 	line-height: 1.6842;
-	margin: 83px 0 83px 83px;
+	margin: 40px;
 	vertical-align: baseline;
 }
 
+@media screen and (min-width: 743px) {
+	body {
+		margin: 83px 0 83px 83px;
+	}
+}
 
+
 /**
  * 2.0 Typography
  */
@@ -455,8 +461,10 @@
 	unicode-bidi: embed;
 }
 
-.rtl body {
-	margin: 83px 83px 83px 0;
+@media screen and (min-width: 743px) {
+	.rtl body {
+		margin: 83px 83px 83px 0;
+	}
 }
 
 .rtl blockquote {
@@ -488,4 +496,4 @@
 
 .rtl .wp-caption.alignleft {
 	margin: 8px 32px 8px 0;
-}
\ No newline at end of file
+}