Tutorial Slide In Image Boxes

From the footer of the v8 design of CSS-Tricks.
View Demo
footer {
clear:both;
overflow:hidden;
font-size:16px;
line-height:1.3;
}
#footer-boxes {
-moz-column-count:2;
-moz-column-gap:10px;
-webkit-column-count:2;
-webkit-column-gap:10px;
column-count:4;
column-gap:10px;
}
.footer-box {
margin:0 0 10px 0;
display:inline-block;