* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
body {
	background: #363636;
}
.scrollable {
	overflow-x: auto;
	overflow-y: hidden;
	position: static;
	white-space: nowrap;
}
.wrapper {
	width: 800px;
	margin: 50px auto;
	position: relative;
}
.list {
	list-style: none;
	overflow-y: auto;
	overflow-y: hidden;
	width: 800px;
	height: 187px;
	font-size: 0;/*此处的 'font-size:0' 是为了解决inline-block带来的间距问题*/
}
.list li {
	display: inline-block;
	width: 220px;
	height: 170px;
	margin-right: 10px;
}
.list li:last-child{margin-right:0;}
.list li img {
	width: 100%;
	height: 100%;
	border: 10px solid #fff;
}
.scrollable::before, .scrollable::after {
	content: " ";
	height: 100%;
	position: absolute;
	top: 0;
	width: 25px;
	z-index: 1;
}
.scrollable.is-scrolled::before {
	background: linear-gradient(to right, #f4f4f4, rgba(244, 244, 244, 0));
	left: 0px;
	visibility: visible;
}
.scrollable::after {
	background: linear-gradient(to right, rgba(244, 244, 244, 0), #f4f4f4);
	right: 0;
	visibility: visible;
}
.scrollable.is-end::after {
	background: none;
	right: 0;
	visibility: visible;
}