https://jsfiddle.net/pju4qjgs/<div class="in">
<div class="voronka">
<div class="one_block">
</div>
<div class="one_block">
</div>
<div class="one_block">
</div>
<div class="one_block">
</div>
<div class="one_block">
</div>
<div class="one_block">
</div>
<div class="one_block">
</div>
<div class="one_block">
</div>
<div class="one_block">
</div>
</div>
</div>
.in {
width: 100%;
height: 100%;
padding: 15px;
padding-right: 0px;
box-sizing: border-box;
}
.voronka {
width: 100%;
overflow: scroll;
}
.voronka > .one_block {
width: 25%;
min-width: 300px;
max-width: 500px;
margin-right: 15px;
border:2px solid #000;
height: 100px;
float: left;
}