.margin .row>div{width:100%}.margin .row>div.margin-height-20{height:20px}.margin .row>div.margin-height-30{height:30px}.margin .row>div.margin-height-40{height:40px}.margin .row>div.margin-height-50{height:50px}.margin .row>div.margin-height-60{height:60px}.margin .row>div.margin-height-70{height:70px}.margin .row>div.margin-height-80{height:80px}