What do push/pull classes do in a grid system?
问题 When I look at a lot of CSS grid systems and frameworks they usually have a standard column and row setup with percentage widths. Something like this for example: standard grid column: .col-10 { width: 83.33333%; width: calc(100% / 12 * 10); width: -webkit-calc(100% / 12 * 10); width: -moz-calc(100% / 12 * 10); } However, in addition to this, I often see other classes like .push or .pull . For example like this: push/pull classes: .push-10 { left: 83.33333%; left: calc(100% / 12 * 10); left: