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Load Bootstrap CSS

// Register Style
function bootstrap_css() {

	wp_register_style( 'bootstrap', '/css/bootstrap.min.css', false, false, 'screen' );
	wp_enqueue_style( 'bootstrap' );

	wp_register_style( 'custom', '/style.css', false, false, 'screen' );
	wp_enqueue_style( 'custom' );

}

// Hook into the 'wp_enqueue_scripts' action
add_action( 'wp_enqueue_scripts', 'bootstrap_css' );