This worked for me…

To hide the tabs: in css/pop-widget.css, find this part:

ul.pop-widget-tabs li{
padding:0;
float:left;
display:inline;
line-height:30px;
border:1px solid #f5f5f5;
font-weight:bold;
margin:0 1px 1px 0;
font-size:11px;
list-style:none;
cursor:pointer;
}

And change display from “inline” to “none.”

For reducing spacing: also in css/pop-widget.css, find this part:

div.pop-inside ul li p{
margin:0;padding:0;
}

And add this:

line-height=1em;

Hope this works for you! If you need to change anything else, all I did was view the widget on my website, right-click on the text or tab or whatever offensive element, and click “inspect element.” It showed me the css classes, so I knew which ones to edit.