.one-half, .one-third, .one-fourth, .two-third, .three-fourth {
    float: left;
    margin-right: 3%;
}

.one-half{
    margin-right: 4%;
}

.one-half {
    width: 48%;
}

.one-third {
    width: 31.333%;
}

.two-third {
    width: 64.666%;
}

.one-fourth {
    width: 23%;
}

.three-fourth {
    width:73%;
}

.one-fifth {
    width: 18%;
}

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