diff --git a/wp-content/themes/twentynineteen/inc/color-patterns.php b/wp-content/themes/twentynineteen/inc/color-patterns.php
index c16c1d6a49..be9b5efca9 100644
--- a/wp-content/themes/twentynineteen/inc/color-patterns.php
+++ b/wp-content/themes/twentynineteen/inc/color-patterns.php
@@ -132,14 +132,20 @@ function twentynineteen_custom_colors_css() {
 		}
 
 		/*
-		 * Set border color for:
+		 * Set left border color for:
 		 * wp block quote
-		 * :focus
 		 */
 		blockquote,
 		.entry .entry-content blockquote,
 		.entry .entry-content .wp-block-quote:not(.is-large),
-		.entry .entry-content .wp-block-quote:not(.is-style-large),
+		.entry .entry-content .wp-block-quote:not(.is-style-large) {
+			border-left-color: hsl( ' . $primary_color . ', ' . $saturation . ', ' . $lightness . ' ); /* base: #0073a8; */
+		}
+
+		/*
+		 * Set border color for:
+		 * :focus
+		 */
 		input[type="text"]:focus,
 		input[type="email"]:focus,
 		input[type="url"]:focus,
@@ -225,7 +231,7 @@ function twentynineteen_custom_colors_css() {
 
 		.editor-block-list__layout .editor-block-list__block .wp-block-quote:not(.is-large):not(.is-style-large),
 		.editor-styles-wrapper .editor-block-list__layout .wp-block-freeform blockquote {
-			border-color: hsl( ' . $primary_color . ', ' . $saturation . ', ' . $lightness . ' ); /* base: #0073a8; */
+			border-left: 2px solid hsl( ' . $primary_color . ', ' . $saturation . ', ' . $lightness . ' ); /* base: #0073a8; */
 		}
 
 		.editor-block-list__layout .editor-block-list__block .wp-block-pullquote.is-style-solid-color:not(.has-background-color) {
diff --git a/wp-content/themes/twentynineteen/sass/blocks/_blocks.scss b/wp-content/themes/twentynineteen/sass/blocks/_blocks.scss
index 479ee33d25..4dd493acea 100644
--- a/wp-content/themes/twentynineteen/sass/blocks/_blocks.scss
+++ b/wp-content/themes/twentynineteen/sass/blocks/_blocks.scss
@@ -452,8 +452,7 @@
 
 		&:not(.is-large),
 		&:not(.is-style-large) {
-			border-width: 2px;
-			border-color: $color__link;
+			border-left: 2px solid $color__link;
 			padding-top: 0;
 			padding-bottom: 0;
 		}
diff --git a/wp-content/themes/twentynineteen/style-editor.css b/wp-content/themes/twentynineteen/style-editor.css
index 51a0f4e7ab..56c511bc1f 100644
--- a/wp-content/themes/twentynineteen/style-editor.css
+++ b/wp-content/themes/twentynineteen/style-editor.css
@@ -940,8 +940,7 @@ figcaption,
 
 /** === Blockquote === */
 .wp-block-quote:not(.is-large):not(.is-style-large) {
-  border-width: 2px;
-  border-color: #0073aa;
+  border-left: 2px solid #0073aa;
 }
 
 .wp-block-quote.is-large, .wp-block-quote.is-style-large {
diff --git a/wp-content/themes/twentynineteen/style-editor.scss b/wp-content/themes/twentynineteen/style-editor.scss
index 43ce4a94b6..9047a82b73 100644
--- a/wp-content/themes/twentynineteen/style-editor.scss
+++ b/wp-content/themes/twentynineteen/style-editor.scss
@@ -391,8 +391,7 @@ figcaption,
 .wp-block-quote {
 
 	&:not(.is-large):not(.is-style-large) {
-		border-width: 2px;
-		border-color: $color__link;
+		border-left: 2px solid $color__link;
 	}
 
 	&.is-large,
diff --git a/wp-content/themes/twentynineteen/style-rtl.css b/wp-content/themes/twentynineteen/style-rtl.css
index 7f90ff85bc..756b197932 100644
--- a/wp-content/themes/twentynineteen/style-rtl.css
+++ b/wp-content/themes/twentynineteen/style-rtl.css
@@ -5477,8 +5477,7 @@ body.page .main-navigation {
 }
 
 .entry .entry-content .wp-block-quote:not(.is-large), .entry .entry-content .wp-block-quote:not(.is-style-large) {
-  border-width: 2px;
-  border-color: #0073aa;
+  border-right: 2px solid #0073aa;
   padding-top: 0;
   padding-bottom: 0;
 }
diff --git a/wp-content/themes/twentynineteen/style.css b/wp-content/themes/twentynineteen/style.css
index 0185b404e5..d415a7ba77 100644
--- a/wp-content/themes/twentynineteen/style.css
+++ b/wp-content/themes/twentynineteen/style.css
@@ -5663,8 +5663,7 @@ body.page .main-navigation {
 }
 
 .entry .entry-content .wp-block-quote:not(.is-large), .entry .entry-content .wp-block-quote:not(.is-style-large) {
-  border-width: 2px;
-  border-color: #0073aa;
+  border-left: 2px solid #0073aa;
   padding-top: 0;
   padding-bottom: 0;
 }
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 587fb92267..c0ecc3bf32 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-RC1-44740';
+$wp_version = '5.1-RC1-44743';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.