How to adapt my template's css style to a plugin's css style

[brenosilver]

Hi I am trying to make the css style for a sidebar plugin called Wordpress Popular Posts the same as in my theme sidebar (WPTube 4).

This is the css style for wptube's siderbar.

/*------------------------sidebar
*/
#sidebar{
	width:323px;/*348*/
	background:#282828;
	border-radius: 10px;
	float:right;
	padding:20px 12px 0 13px;
	}
.sidebarcont{
	width:323px;
	}
#sidebar h2{
	font-size:18px;
	text-transform:uppercase;
	font-weight:normal;
	padding-bottom:3px;
	margin-bottom:20px;
	border-bottom:4px solid #1d1f1e;
	}
.postcontent{
	width:323px;
	overflow:hidden;
	border-bottom:1px solid #000;
	margin-bottom:11px;
	padding:0 0 8px 0;
	}
.postcontent:last-child{
	border:none;
	}
.imgentry{
	width:110px;/*120*/
	height:74px;/*84*/
	border-radius: 5px;
	float:left;
	background:url(images/bgr_sidebarimgbx.jpg) no-repeat;
	padding:5px;
	}
.textentry{
	width:174px;/*202*/
	float:right;
	padding:0 14px;
	}
.texttitle{
	padding-bottom:8px;
	}
.textentry h3{
	font-size:14px;
	padding-bottom:4px;
	}
.textentry span{
	font-size:11px;
	display:block;
	}
.textentry p{
	font-size:11px;
	padding-bottom:10px;
	}
.textmeta a{
	color:#fff;
	}
.commenttxt{
	width:auto;
	float:left;
	font-size:11px;
	display:block;
	margin-right:13px;
	}
.commentbg{
	width:21px;
	height:17px;
	display:block;
	text-align:center;
	color:#fff;
	font-size:11px;
	float:left;
	font-weight:bold;
	line-height:12px;
	background: url(images/ico_comment.jpg) no-repeat;
	}
.textwidget,.widget_categories{ padding-bottom:19px }

This is for the plugin WordPress Popular posts

/*
Wordpress Popular Posts plugin stylesheet
Developed by Hector Cabrera

Use the following classes to style your popular posts list as you like.
*/

/* title styles */
.wpp-post-title {
}

/* thumbnail styles */
img.wpp-thumbnail {
	border:none;
}

/* excerpt styles */
.wpp-excerpt {
}

/* Stats tag styles */
.post-stats {
	font-size:9px;
	font-weight:bold;
}

	.wpp-comments {
	}

	.wpp-views {
	}

	.wpp-author {
		font-style:italic;
	}

	.wpp-date {
	}

/* WP-PostRatings styles */
.wpp-rating {
}

My website http://videohater.com/ as you can see in the page I did some progress (Just copied and pasted some stuff), but I can't get it right.

Could somebody give me a hand please?

Thank you!