una/template/css/page_layouts.css

/* common styles */

.bx-layout-col {
    float:left;
}

/* layout 1 column */

.bx-layout-1-column-column1 {
    float:none;
}

/* layout 3 columns */

.bx-layout-3-columns-column3,
.bx-layout-3-columns-column1 {
    width:33.3%;
}
.bx-layout-3-columns-column2 {
    width:33.4%;
}

/* layout 2 columns */

.bx-layout-2-columns-column1,
.bx-layout-2-columns-column2 {
    width:50%;
}

/* layout bar left */

.bx-layout-bar-left-bar {
    width:34%;
}

.bx-layout-bar-left-content {
    width:66%;
}

/* layout bar right */

.bx-layout-bar-right-bar {
    width:34%;
}

.bx-layout-bar-right-content {
    width:66%;
}