Basit bir .css sorunu fakat çözemedim

ul.tabs li {
	overflow: hidden;
}
#part-alan {
width:45px;
float:left;
margin-left:-20px;
margin-right:5px;
}

#part-kutu {
width:25px;
height:26px;
background:url(http://www.izletime.com/img/part-button.png) no-repeat;
}

#part-kutu:hover {
color:#8c8c8c;
width:25px;
height:26px;
background:url(http://www.izletime.com/img/part-button-hover.png) no-repeat;
}

#part-kutu a {
color:#8c8c8c;
width:25px;
height:26px;
display:block;
text-align:center;
cursor:pointer;
}

html ul.part-kutu li.active, html ul.part-kutu li.active a:hover  {
	background: #fff;
	border-bottom: 1px solid #fff;
}