Cannot get background color on widget to remove

Hey Guys

I’m trying to remove the background color from a specific class of widget, but for the life of me cannot get the damn thing to change.

I was testing it with a random color earlier and got it to work, then after changing the background to “none”, nothing happened. I cleared internet history and still nothing. I cannot see where I’ve made a mistake.

Here is the code in style.css:

#sidebar .widget widget_sp_image {
	margin-bottom:15px;
	background:none;
	padding:15px;
	font-size:13px;
}

This is the HTML for the widget itself:

<div id="widget_sp_image-4" class="widget widget_sp_image"><img alt="" class="attachment-full aligncenter" style="max-width: 100%;" src="https://www.paperandrye.com/wp-content/uploads/2014/04/seperator.png" pagespeed_url_hash="450633582" height="12" width="272"></div>

I suppose I could do the individual widget itself, but I’d like to do any image widget that I put up there. Although I couldn’t get the individual widget working either. I’m not sure if I’m blind to something obvious or if there’s something overriding it?

The widget is acting as a separator between the recent posts and categories widgets. You can see the widget here: https://www.paperandrye.com

Any idea what’s going on here?