CSS styles not displaying (well not all)

I have gone through the support forums to try to resolve this issue, still need some help. I am trying to apply CSS styles to the feed (adjust line spacing, remove bullet points…)

I am using this short code: [twitter-widget username="PerspecSys" items="3"]

This is my test sIte:
https://tinyurl.com/kwlzt53

I tried to use the following style (in my style.css file):

.widget_twitter ul {
	list-style-type: none;
	padding-left: 0;}

but the style changes are not displaying…

But these styles DO work (they are in the same spot as the code that is not working):

.retweet:after,
.in-reply-to:after {
     content: ' | ';}

.twitterwidget-title{
	display:none !important;}

My sidebar deceleration in functions.php seems to be in order:

if (function_exists('register_sidebar')) {
    	register_sidebar(array(
    		'name' => 'Sidebar Widgets',
    		'id'   => 'sidebar-widgets',
    		'description'   => 'These are widgets for the sidebar.',
    		'before_widget' => '<div id="%1$s" class="widget %2$s">',
    		'after_widget'  => '</div>',
    		'before_title'  => '<h2>',
    		'after_title'   => '</h2>'
    	));
    }

Any ideas?
Thanks in advance!

https://www.ads-software.com/extend/plugins/twitter-widget-pro/