diff --git a/wp-content/themes/twentytwelve/css/blocks.css b/wp-content/themes/twentytwelve/css/blocks.css
index f197481906..554ddd3fe3 100644
--- a/wp-content/themes/twentytwelve/css/blocks.css
+++ b/wp-content/themes/twentytwelve/css/blocks.css
@@ -244,19 +244,9 @@ pre.wp-block-code {
 
 /* Buttons */
 
-.wp-block-button .wp-block-button__link,
-.wp-block-button .wp-block-button__link:visited {
-	background-color: #e6e6e6;
-	background-repeat: repeat-x;
-	background-image: -moz-linear-gradient(top, #f4f4f4, #e6e6e6);
-	background-image: -ms-linear-gradient(top, #f4f4f4, #e6e6e6);
-	background-image: -webkit-linear-gradient(top, #f4f4f4, #e6e6e6);
-	background-image: -o-linear-gradient(top, #f4f4f4, #e6e6e6);
-	background-image: linear-gradient(top, #f4f4f4, #e6e6e6);
+.wp-block-button .wp-block-button__link {
 	border: 1px solid #d2d2d2;
 	border-radius: 3px;
-	box-shadow: 0 1px 2px rgba(64, 64, 64, 0.1);
-	color: #7c7c7c;
 	font-family: inherit;
 	font-size: 11px;
 	font-size: 0.785714286rem;
@@ -266,20 +256,48 @@ pre.wp-block-code {
 	padding: 0.428571429rem 0.714285714rem;
 }
 
-.wp-block-button .wp-block-button__link:hover,
-.wp-block-button .wp-block-button__link:focus {
+.entry-content .wp-block-button__link,
+.entry-content .wp-block-button__link:visited {
+	background-color: #e6e6e6;
+	color: #7c7c7c;
+}
+
+.entry-content .wp-block-button__link:hover,
+.entry-content .wp-block-button__link:visited:hover,
+.entry-content .wp-block-button__link:focus {
 	background-color: #ebebeb;
+	color: #5e5e5e;
+}
+
+.entry-content .wp-block-button__link:active {
+	background-color: #e1e1e1;
+	color: #757575;
+}
+
+.wp-block-button__link:not(.has-background) {
+	background-repeat: repeat-x;
+	background-image: -moz-linear-gradient(top, #f4f4f4, #e6e6e6);
+	background-image: -ms-linear-gradient(top, #f4f4f4, #e6e6e6);
+	background-image: -webkit-linear-gradient(top, #f4f4f4, #e6e6e6);
+	background-image: -o-linear-gradient(top, #f4f4f4, #e6e6e6);
+	background-image: linear-gradient(top, #f4f4f4, #e6e6e6);
+}
+
+.wp-block-button__link:not(.has-text-color) {
+	box-shadow: 0 1px 2px rgba(64, 64, 64, 0.1);
+}
+
+.wp-block-button__link:not(.has-background):hover,
+.wp-block-button__link:not(.has-background):focus {
 	background-image: -moz-linear-gradient(top, #f9f9f9, #ebebeb);
 	background-image: -ms-linear-gradient(top, #f9f9f9, #ebebeb);
 	background-image: -webkit-linear-gradient(top, #f9f9f9, #ebebeb);
 	background-image: -o-linear-gradient(top, #f9f9f9, #ebebeb);
 	background-image: linear-gradient(top, #f9f9f9, #ebebeb);
 	background-repeat: repeat-x;
-	color: #5e5e5e;
 }
 
-.wp-block-button .wp-block-button__link:active {
-	background-color: #e1e1e1;
+.wp-block-button__link:not(.has-background):active {
 	background-image: -moz-linear-gradient(top, #ebebeb, #e1e1e1);
 	background-image: -ms-linear-gradient(top, #ebebeb, #e1e1e1);
 	background-image: -webkit-linear-gradient(top, #ebebeb, #e1e1e1);
@@ -287,8 +305,10 @@ pre.wp-block-code {
 	background-image: linear-gradient(top, #ebebeb, #e1e1e1);
 	background-repeat: repeat-x;
 	border-color: transparent;
+}
+
+.wp-block-button__link:not(.has-text-color):active {
 	box-shadow: inset 0 0 8px 2px #c6c6c6, 0 1px 0 0 #f4f4f4;
-	color: #757575;
 }
 
 /* Separator */
@@ -367,42 +387,52 @@ pre.wp-block-code {
 6.0 Blocks - Colors
 --------------------------------------------------------------*/
 
-.has-blue-color {
+.entry-content .has-blue-color,
+.entry-content .has-blue-color:visited {
 	color: #21759b;
 }
 
-.has-blue-background-color {
+.entry-content .has-blue-background-color,
+.entry-content .has-blue-background-color:visited {
 	background-color: #21759b;
 }
 
-.has-dark-gray-color {
+.entry-content .has-dark-gray-color,
+.entry-content .has-dark-gray-color:visited {
 	color: #373737;
 }
 
-.has-dark-gray-background-color {
+.entry-content .has-dark-gray-background-color,
+.entry-content .has-dark-gray-background-color:visited {
 	background-color: #373737;
 }
 
-.has-medium-gray-color {
+.entry-content .has-medium-gray-color,
+.entry-content .has-medium-gray-color:visited {
 	color: #9f9f9f;
 }
 
-.has-medium-gray-background-color {
+.entry-content .has-medium-gray-background-color,
+.entry-content .has-medium-gray-background-color:visited {
 	background-color: #9f9f9f;
 }
 
-.has-light-gray-color {
+.entry-content .has-light-gray-color,
+.entry-content .has-light-gray-color:visited {
 	color: #e6e6e6;
 }
 
-.has-light-gray-background-color {
+.entry-content .has-light-gray-background-color,
+.entry-content .has-light-gray-background-color:visited {
 	background-color: #e6e6e6;
 }
 
-.has-white-color {
+.entry-content .has-white-color,
+.entry-content .has-white-color:visited {
 	color: #fff;
 }
 
-.has-white-background-color {
+.entry-content .has-white-background-color,
+.entry-content .has-white-background-color:visited {
 	background-color: #fff;
 }
diff --git a/wp-content/themes/twentytwelve/css/editor-blocks.css b/wp-content/themes/twentytwelve/css/editor-blocks.css
index 7b40361ed0..b8687a711c 100644
--- a/wp-content/themes/twentytwelve/css/editor-blocks.css
+++ b/wp-content/themes/twentytwelve/css/editor-blocks.css
@@ -235,7 +235,7 @@ p.has-drop-cap:not(:focus)::first-letter {
 }
 
 .wp-block-file .wp-block-file__button,
-.wp-block-button .wp-block-button__link:hover {
+.wp-block-button .wp-block-file__button:hover {
 	background-color: #e6e6e6;
 	background-repeat: repeat-x;
 	background-image: -moz-linear-gradient(top, #f4f4f4, #e6e6e6);
@@ -335,19 +335,14 @@ p.has-drop-cap:not(:focus)::first-letter {
 
 /* Buttons */
 
-.wp-block-button .wp-block-button__link,
-.wp-block-button .wp-block-button__link:hover {
+.wp-block-button__link {
 	background-color: #e6e6e6;
-	background-repeat: repeat-x;
-	background-image: -moz-linear-gradient(top, #f4f4f4, #e6e6e6);
-	background-image: -ms-linear-gradient(top, #f4f4f4, #e6e6e6);
-	background-image: -webkit-linear-gradient(top, #f4f4f4, #e6e6e6);
-	background-image: -o-linear-gradient(top, #f4f4f4, #e6e6e6);
-	background-image: linear-gradient(top, #f4f4f4, #e6e6e6);
+	color: #7c7c7c;
+}
+
+.wp-block-button .wp-block-button__link {
 	border: 1px solid #d2d2d2;
 	border-radius: 3px;
-	box-shadow: 0 1px 2px rgba(64, 64, 64, 0.1);
-	color: #7c7c7c;
 	font-family: inherit;
 	font-size: 11px;
 	font-weight: normal;
@@ -355,6 +350,23 @@ p.has-drop-cap:not(:focus)::first-letter {
 	padding: 6px 10px;
 }
 
+.wp-block-button .editor-rich-text__tinymce.mce-content-body {
+	line-height: 1.428571429;
+}
+
+.wp-block-button__link:not(.has-text-color) {
+	box-shadow: 0 1px 2px rgba(64, 64, 64, 0.1);
+}
+
+.wp-block-button .wp-block-button__link:not(.has-background) {
+	background-image: -moz-linear-gradient(top, #f4f4f4, #e6e6e6);
+	background-image: -ms-linear-gradient(top, #f4f4f4, #e6e6e6);
+	background-image: -webkit-linear-gradient(top, #f4f4f4, #e6e6e6);
+	background-image: -o-linear-gradient(top, #f4f4f4, #e6e6e6);
+	background-image: linear-gradient(top, #f4f4f4, #e6e6e6);
+	background-repeat: repeat-x;
+}
+
 /* Separator */
 
 .editor-block-list__block hr.wp-block-separator {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 2a3445989f..a4c9d85eb9 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44302';
+$wp_version = '5.1-alpha-44303';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.