Index: src/wp-content/themes/twentyseventeen/style.css
===================================================================
--- src/wp-content/themes/twentyseventeen/style.css	(revision 39132)
+++ src/wp-content/themes/twentyseventeen/style.css	(working copy)
@@ -3907,13 +3907,6 @@
 	}
 }
 
-@media screen and ( min-width: 55em ) {
-
-	.panel-image {
-		background-attachment: fixed;
-	}
-}
-
 @media screen and ( min-width: 67em ) {
 
 	/* Layout */
@@ -3978,6 +3971,13 @@
 	}
 }
 
+@media screen and ( min-width: 85.45em ) {
+
+	.panel-image {
+		background-attachment: fixed;
+	}
+}
+
 @media screen and ( max-width: 48.875em ) and ( min-width: 48em ) {
 
 	.admin-bar .site-navigation-fixed.navigation-top,