*{
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
.slider{
	position: relative;
	overflow: hidden;
}
.slider ul{
	list-style: none;
	float: left;
}
.slider ul li{
	float: left;
}
.slider .mask{
	position: absolute;
	bottom: 0;
	width: 100%;
	background-color: rgba(0, 0, 0, .3);
}
.slider .mask .sliderBtn{
	position: absolute;
	border-radius: 50%;
	background-color: #fff;
	cursor: pointer;
	background: radial-gradient(white 20%, transparent 50%);
}
.slider .mask .sliderBtn.current{
	background: radial-gradient(white 10%, transparent 30%, white 70%);
}
.slider .prev, .slider .next{
	position: absolute;
	width: 45px; 
	height: 100%;
	background-color: rgba(0, 0, 0, .2);
	cursor: pointer;
	top: 0;
	display: none;
}
.slider .prev{
	left: 0;
}
.slider .next{
	right: 0;
}
.slider .prev img, .slider .next img{
	position: absolute;
	top: 50%;
	left: 50%;
	margin-top: -22.5px;
	margin-left: -22.5px;
}