.one_half { width: 48% }
.one_third { width: 30.66% }
.two_third { width: 65.33% }
.one_fourth { width: 22% }
.three_fourth { width: 74% }
.one_fifth { width: 16.8% }
.two_fifth { width: 37.6% }
.three_fifth { width: 58.4% }
.four_fifth { width: 67.2% }
.one_sixth { width: 13.33% }
.five_sixth { width: 82.67% }
.one_half,
.one_third,
.two_third,
.three_fourth,
.one_fourth,
.one_fifth,
.two_fifth,
.three_fifth,
.four_fifth,
.one_sixth,
.five_sixth {
    float: left;
    margin-bottom: 20px;
    margin-right: 4%;
    position: relative;
}
.column-last {
    clear: right;
    margin-right: 0!important;
}
.clear {
    clear: both;
    display: block;
    font-size: 0;
    height: 0;
    line-height: 0;
    width: 100%;
}