.one_half { width:48%; margin-right: 4%; }

.one_third { width:30.6%; margin-right: 4%; }

.two_third { width:65.4%; margin-right: 4%; }

.one_fourth { width:22.75%; margin-right: 3%; }

.three_fourth { width:74.25%; margin-right: 3%; }

.one_fifth { width:18.4%; margin-right: 2%; }

.two_fifth { width:39.2%; margin-right: 2%; }

.three_fifth { width:58.8%; margin-right: 2%; }

.four_fifth { width:79.6%; margin-right: 2%; }

.one_sixth { width:16.5%; margin-right: 1%;}

.five_sixth { width:82.5%; margin-right: 1%;}

.one_half, .one_third, .two_third, .three_fourth, .one_fourth, .one_fifth, .two_fifth, .three_fifth, .four_fifth, .one_sixth, .five_sixth { float:left; z-index: 1 !important; /*margin-top: 0.8em;margin-bottom: 1.6em;*/ }

.last { margin-right:0 !important; clear:right; }

.clear-column { clear:both; display:block; height:0; width:100%; margin-bottom: 3em; }

 @media only screen and (max-width: 640px) {

.one_half, .one_third, .one_fourth, .one_fifth, .one_sixth { width:50%; margin-right: 0%;}

}

 @media only screen and (max-width: 480px) {

.one_half, .one_third, .one_fourth, .one_fifth, .one_sixth, .two_third { width:100%; margin-bottom: 0.5em;margin-right: 0%; }

}