I'm using CSS3 Multiple Columns. Inner elements have position:relative and can contain arrows with position:absolute.
.clm3{
-webkit-column-count: 3;
-moz-column-count: 3;
column-count: 3;
-webkit-column-gap: 0;
-moz-column-gap: 0;
column-gap: 0;
}
Problem: CSS3 column cut off part of arrow with position:absolute.
Example: http://jsfiddle.net/k4ucr72h/