WordPress Admin Customizer Controls Side-bar width size

customize-controls-width.php

<?php
add_action( 'customize_controls_print_styles', function() {
  // TODO: consider max-width for the sidebar size
	echo '<style>
		body {
			--site-width-size: 1280px;
			--site-width-customizer-extra: 80px;
		} 
		.wp-full-overlay.expanded {
			margin-left: calc( 100vw - var( --site-width-size ) - var( --site-width-customizer-extra ) );
		}
		#customize-controls.wp-full-overlay-sidebar {
			width: calc( 100vw - var( --site-width-size ) - var( --site-width-customizer-extra ) );
		}
		</style>';
} );