* { padding: 0; margin: 0; list-style: none; border: 0 }

.slider {
	overflow: hidden;
	position: relative
}
.slider ul.slider_liste li {
	font-size: 0;
	width: 100%;
	float: left
}
.slider ul.slider_liste li a img {
	width: 100%
}

/* buton */
a.onceki, a.sonraki {
	width: 70px;
	height: 70px;
	text-decoration: none;
	font: 32px/70px Arial;
	color: #fff;
	border-radius: 100px;
	position: absolute;
	top: 50%;
	margin-top: -35px;
	background: rgba(0, 0, 0, .5);
	text-align: center
}
a.onceki { left: 20px }
a.sonraki { right: 20px }
a.onceki:hover, a.sonraki:hover { background: #000 }