left column, width = 100px
left column, width = 100px
left column, width = 100px
left column, width = 100px
left column, width = 100px
left column, width = 100px
left column, width = 100px
left column, width = 100px
left column, width = 100px
left column, width = 100px
right column, width = whole - 100px
right column, width = whole - 100px
right column, width = whole - 100px