Dismissible notice

dismissible-notice.php

<?php

function wpdesk_dismisible_info_notice_for_administrator() {
    $user = wp_get current_user();
    if ( in_array( 'administrator', $user->roles ) ) {
        ?>
        <div class="notice notice-info is-dismissible">
            <p>Info notice for administrator.</p>
        </div>
        <?php
    }
}
add_action( 'admin notices', 'wpdesk_dismisible_info_notice_for_administrator' );