CSS:cols with same height

same_hieght_cols

CSS
.b-cols_layout_cols_2_same_height .b-cols__col_position_left{
    width: 50%;
    float:left;
}
.b-cols_layout_cols_2_same_height .b-cols__col_position_right{
    width: 100%;
    float:left;
    margin:0 0 0 100%;
}
.b-cols_layout_cols_2_same_height .b-cols__left-col-content {
    float:left;
    width:100%;
    margin:0 0 0 -100%;
}
.b-cols_layout_cols_2_same_height .b-cols__right-col-content {
    float:left;
}

HTML

{
    block: 'b-cols',
    mix: [{block: 'b-content'}, {block: 'i-clearfix'}],
    mods: {layout: 'cols_2_same_height'},
    content: [
        {
            elem: 'col',
            elemMods: {position: 'left'},
            content: {
                elem: 'col',
                elemMods: {position: 'right'},
                content: [
                   {
                       elem: 'left-col-content',
                            content: 'left'
                    },
                    {
                        elem: 'right-col-content',
                        content: 'right'
                    }
            ]
         }
         }
         ]
         }