2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 #responsive-form{max-width:600px;margin:0 auto;width:100%}.form-row{width:100%}.column-half,.column-full{float:left;position:relative;padding:.65rem;width:100%;-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box}.clearfix:after{content:"";display:table;clear:both}@media only screen and (min-width:48em){.column-half{width:50%}}