Dequeues the default stylesheet from the Ultimate Posts Widget plugin.

dequeue-upw-styles.php

<?php
add_action( 'wp_enqueue_scripts', 'themename_dequeue_upw_styles', 999 );
/**
 * Dequeues the default stylesheet from the Ultimate Posts Widget plugin.
 *
 * We're going to style the widget ourselves, so instead of loading and
 * overriding unnecessary styles, we're just going to remove the stylesheet.
 *
 * @since 1.0.0
 *
 * @param none
 * @return null
 */
function themename_dequeue_upw_styles() {

	wp_dequeue_style( 'upw_theme_standard' );

}