.container { /* Container that holds the items */
column-count: 4;
column-gap: 1em;
}
.item { /* The tiled items */
background-color: #eee;
display: inline-block;
margin: 0 0 1em;
width: 100%;
}
content_copy
Looks like Pinterest and is the same code used on this site. You can adjust column number and it will self-adjust the width of each item/ cell according to parent element.
http://w3bits.com/css-masonry/