<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;
}