.column {
    float: left;
    position: relative;
    width: 33%;

    /*for demo purposes only */
    background: #f2f2f2;
    border: 1px solid #e6e6e6;
    box-sizing: border-box;
}

.column-offset-1 {
    left: 33%;
}
.column-offset-2 {
    left: 66%;
}


.column-inset-1 {
    left: -33%;
}
.column-inset-2 {
    left: -66%;
}