diff --git a/includes/ui/class-ui-elements.php b/includes/ui/class-ui-elements.php
index a86cd4bd2..a2eb860fd 100644
--- a/includes/ui/class-ui-elements.php
+++ b/includes/ui/class-ui-elements.php
@@ -96,7 +96,7 @@ public static function button( $args, $class ) {
 		}
 
 		$attrs = [
-			'class' => join( ' ', [ $class, $args['class'] ] ),
+			'class' => implode( ' ', [ $class, $args['class'] ] ),
 			'href'  => esc_url( $args['url'] ),
 		];
 
diff --git a/includes/ui/class-ui-settings.php b/includes/ui/class-ui-settings.php
index 0fed89303..1ba3655e7 100644
--- a/includes/ui/class-ui-settings.php
+++ b/includes/ui/class-ui-settings.php
@@ -91,7 +91,6 @@ public function preview_ui_elements() {
 					[
 						'url'   => '/',
 						'label' => 'Sign in',
-						'class' => [],
 					],
 				],
 			]
@@ -139,12 +138,10 @@ public function preview_ui_elements() {
 					[
 						'url'   => '/',
 						'label' => 'Sign in',
-						'class' => [],
 					],
 					[
 						'url'   => '/',
 						'label' => 'Create Account',
-						'class' => [],
 					],
 				],
 			]