Column_header_color = {r=0.4, g=0.4, b=0.4}

    -- column header
    App.color(Column_header_color)
    love.graphics.rectangle('fill', x-Display_settings.x - Margin_left, 0, Margin_left + Display_settings.column_width + Margin_right, Header_height)
    App.color(Text_color)
    love.graphics.print(column.name, x-Display_settings.x, 5)