#portfolio div{
	position:absolute;
	background:#fff;
	width:676px;
	height:350px;

	left: 0;
}

#portfolio img {
	width: 676px;
	height: 326px;
	left: 0;
}

.mask{
	position:relative; 
	width:676px;
	height:370px;
	overflow:hidden;
	margin: 0 auto;
}

.mask img{
	position:absolute;
	display:block;
	border:none;
}

.buttons {
	margin-top: 20px;
}

.buttons img {
	padding: 0 5px 5px 5px;
}

.buttons span.active {
	border-bottom: 5px solid #FFF;
}

.buttons span:hover{
	border-bottom: 5px solid #FFF;
}