div align right checkboxInput in shiny dashboard not working

My shiny dashboard has checkboxInput and I am trying to align it to right within the title of the box item. For smaller boxes (width of 6) the alignment is proper, however for boxes with width of 12, which ever way I realign the column values, the checkbox input remains at the middle of the box. The code is as follows:

library(shiny)
library(shinydashboard)


ui <- dashboardPage(
    skin = "green",
    dashboardHeader(
        title = "TEST", titleWidth = 225
        ),
    dashboardSidebar(
        menuItem("TRENDS", tabName = "vactr", icon = shiny::icon("line-chart"))
        ),
    dashboardBody(
        tabItems(
            tabItem(
                tabName = "vactr",
                fluidRow(
                    box(
                        width = 12, status = "info", title = 
                            fluidRow(
                                column(6, "Trend - Usage of space",br(),
                                       div(downloadLink("downloadspacetrend", "Download this chart"), style = "font-size:70%", align = "left")),
                                column(6,
                                       div(checkboxInput(inputId = "spacetrendcheck", "Add to reports", value = FALSE),style = "font-size:70%",float = "right", align = "right", direction = "rtl"))
                                ),
                        div(plotOutput("spacetrend"), width = "100%", height = "400px", style = "font-size:90%;"),
                        uiOutput("spacetrendcomment")
                    )
                )

                )
            )
        )
    )


server <- function(input, output, session) {

}

shinyApp(ui = ui, server = server)

I want the "Add to reports" check box to the right end of the box. I tried using float, direction arguments with and without, but not getting the desired output.