View file views/admin/css/ui.tabs.css

ul.ui-tabs-nav {
	list-style: none;
	padding: 0;
	margin: 0;
	padding-left: 10px;
}
.ui-tabs-nav:after {
    display: block;
    clear: both;
	content: " ";
}

.ui-tabs-hide {
	display: none;
}

ul.ui-tabs-nav li {
	margin: 0;
	padding:0;
	margin-right: 5px;
	padding: 0 5px;
	float:left;
	height: 20px;
}

li.ui-tabs-selected {
	background-color: #6884AB;
}

li.ui-tabs-selected a {
	color: #FFFFFF;
}

/* Additional IE specific bug fixes... */
* html .ui-tabs-nav { /* auto clear @ IE 6 & IE 7 Quirks Mode */
    display: inline-block;
}
*:first-child+html .ui-tabs-nav  { /* auto clear @ IE 7 Standards Mode - do not group selectors, otherwise IE 6 will ignore complete rule (because of the unknown + combinator)... */
    display: inline-block;
}