Index: src/wp-content/themes/twentysixteen/css/blocks.css
===================================================================
--- src/wp-content/themes/twentysixteen/css/blocks.css	(revision 43845)
+++ src/wp-content/themes/twentysixteen/css/blocks.css	(working copy)
@@ -76,6 +76,13 @@
 	width: 100%;
 }
 
+/* Cover */
+
+.wp-block-cover-image.aligncenter,
+.wp-block-cover.aligncenter {
+	display: flex;
+}
+
 /* File */
 
 .wp-block-file .wp-block-file__button {
@@ -240,10 +247,24 @@
 	max-width: 100%;
 }
 
+/* Media & Text */
+
+.wp-block-media-text {
+	margin-bottom: 1.75em;
+}
+
 /*--------------------------------------------------------------
 5.0 Blocks - Widget Blocks
 --------------------------------------------------------------*/
 
+/* Archives, Categories & Latest Posts */
+
+.wp-block-archives.aligncenter,
+.wp-block-categories.aligncenter,
+.wp-block-latest-posts.aligncenter {
+	text-align: center;
+}
+
 /* Latest Comments */
 
 .wp-block-latest-comments__comment-meta a {
Index: src/wp-content/themes/twentysixteen/css/editor-blocks.css
===================================================================
--- src/wp-content/themes/twentysixteen/css/editor-blocks.css	(revision 43845)
+++ src/wp-content/themes/twentysixteen/css/editor-blocks.css	(working copy)
@@ -20,7 +20,6 @@
 
 .edit-post-visual-editor .editor-block-list__block,
 .editor-default-block-appender input[type="text"].editor-default-block-appender__content {
-	color: #1a1a1a;
 	font-family: Merriweather, Georgia, serif;
 	font-size: 16px;
 	font-size: 1rem;
@@ -173,12 +172,14 @@
 
 /* Main column width */
 
-body.gutenberg-editor-page .edit-post-visual-editor .editor-post-title__block,
-body.gutenberg-editor-page .edit-post-visual-editor .editor-default-block-appender,
-body.gutenberg-editor-page .edit-post-visual-editor .editor-block-list__block {
-	max-width: 630px; /* 600px + 30px for padding; should be 840px for pages */
+.editor-styles-wrapper {
+	max-width: 100% !important; /* Override where editor-style.css is affecting this */
 }
 
+.wp-block {
+	max-width: 630px; /* 600px + 30px to account for padding. */
+}
+
 /* Link styles */
 
 .edit-post-visual-editor a,