SOURCE

<div class="wrap">
	<div class="item">1</div>
	<div class="item">2</div>
	<div class="item">3</div>
	<div class="item">4</div>
	<div class="item">5</div>
</div>

.wrap {
	background-color: #fff;
	width: 100%;
	height: 100px;
	display: flex;
	overflow-x: scroll;
}

.item{
	height: 60px;
	width: 33%;
	background-color: yellow;
	margin-right: 20px;
	flex: 0 0 auto;
	margin-left: 20px;
}