at bottom of "page" (some specified height), content flows next column. once column fills well, flows down next "page".'s difference between scroll has been divided columns, , ordinary book pages have been divided columns.see image attached 
try fiddle hope suffice purpose. don't forget include bootstrap
.item { background: #f4f5f7; border: 1px solid darkgrey; } .border-fine{ border-top:0px; border-right:0px; } .border-right{ position:relative; } .border-right:after{ content: ''; position: absolute; z-index: 999; top: 5px; left: 5px; right: 5px; bottom: 5px; border-right: 2px dashed #ccc; } 