If you’ve seen the layout on Pinterest you probably already know what we are going to be creating here. If not, it’s essentially the stacking of divs or images of different sizes with a set number of columns (view demo). We really do love this style of layout, it gives a different kind of look to the standard Bootstrap columns. So let’s begin:-

HTML

<div class="container">
	<div id="list" class="section">
		<div class="item" style="height: 14em;"></div>
		<div class="item" style="height: 26em;"></div>
		<div class="item" style="height: 8em;"></div>
		<div class="item" style="height: 14em;"></div>
		<div class="item" style="height: 8em;"></div>
		<div class="item" style="height: 18em;"></div>
		<div class="item" style="height: 16em;"></div>
		<div class="item" style="height: 12em;"></div>
	</div>		
</div>

CSS

#list {
    width: 100%;
    overflow: hidden;
    margin-bottom: -1.875em;
    -webkit-column-count: 3;
    -webkit-column-gap: 1.875em;
    -webkit-column-fill: auto;
    -moz-column-count: 3;
    -moz-column-gap: 1.875em;
    -moz-column-fill: auto;
    column-count: 3;
    column-gap: 1.875em;
    column-fill: auto;
}

.item {
    background-color: #169fe6;
    margin-bottom: 1.875em;
    -webkit-column-break-inside: avoid;
    -moz-column-break-inside: avoid;
    column-break-inside: avoid;
}

You can see a working demo here.