diff --git a/wp-admin/includes/class-custom-background.php b/wp-admin/includes/class-custom-background.php
index 5c65c6b282..a4ca32f4df 100644
--- a/wp-admin/includes/class-custom-background.php
+++ b/wp-admin/includes/class-custom-background.php
@@ -418,7 +418,7 @@ class Custom_Background {
 	<div class="button-group">
 				<?php foreach ( $group as $value => $input ) : ?>
 		<label>
-			<input class="screen-reader-text" name="background-position" type="radio" value="<?php echo esc_attr( $value ); ?>"<?php checked( $value, $background_position ); ?>>
+			<input class="ui-helper-hidden-accessible" name="background-position" type="radio" value="<?php echo esc_attr( $value ); ?>"<?php checked( $value, $background_position ); ?>>
 			<span class="button display-options position"><span class="<?php echo esc_attr( $input['icon'] ); ?>" aria-hidden="true"></span></span>
 			<span class="screen-reader-text"><?php echo $input['label']; ?></span>
 		</label>
diff --git a/wp-includes/customize/class-wp-customize-background-position-control.php b/wp-includes/customize/class-wp-customize-background-position-control.php
index bb35b052d0..410a0bf597 100644
--- a/wp-includes/customize/class-wp-customize-background-position-control.php
+++ b/wp-includes/customize/class-wp-customize-background-position-control.php
@@ -96,7 +96,7 @@ class WP_Customize_Background_Position_Control extends WP_Customize_Control {
 					<div class="button-group">
 					<?php foreach ( $group as $value => $input ) : ?>
 						<label>
-							<input class="screen-reader-text" name="background-position" type="radio" value="<?php echo esc_attr( $value ); ?>">
+							<input class="ui-helper-hidden-accessible" name="background-position" type="radio" value="<?php echo esc_attr( $value ); ?>">
 							<span class="button display-options position"><span class="<?php echo esc_attr( $input['icon'] ); ?>" aria-hidden="true"></span></span>
 							<span class="screen-reader-text"><?php echo $input['label']; ?></span>
 						</label>
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0c98765500..2c931ecfc2 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51636';
+$wp_version = '5.9-alpha-51637';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.