Your logo on the login page

<?php

add_action(
	'login_enqueue_scripts',
	static function () {
		$logo_id = (int) get_theme_mod( 'custom_logo' );
		if ( ! $logo_id ) {
			$logo_id = (int) get_option( 'site_logo' ); // Block themes.
		}
		$logo = $logo_id ? wp_get_attachment_image_src( $logo_id, 'medium' ) : false;
		if ( ! $logo || empty( $logo[1] ) ) {
			return;
		}
		$height = (int) min( 120, round( 320 * $logo[2] / $logo[1] ) );
		wp_add_inline_style(
			'login',
			sprintf(
				'.login h1 a{background-image:url("%s");background-size:contain;background-position:center;width:100%%;max-width:320px;height:%dpx;}',
				esc_url_raw( $logo[0] ),
				max( 40, $height )
			)
		);
	}
);