r - Shiny: How to adjust the width of the tabsetPanel?

Question

Here is my app embedded in my site. I want to get rid of the scroll widget below my app, this is due to the width of the tabsetPanel.

I embed the app using this code:

<iframe width="800" height="480" frameborder="0" src="http://spark.rstudio.com/alstated/meanvar/"></iframe>

App Codes:

ui.R

library(shiny)

# Define UI for application that plots random distributions 
shinyUI(pageWithSidebar(
  headerPanel(title = ""),
  sidebarPanel(
    sliderInput("size",
                "Number of Observations",
                min = 10,
                max = 200,
                value = 95),

    sliderInput("mu",
                "Mean",
                min = -100, 
                max = 100,
                value = 0),

    sliderInput("sd",
                "Standard Deviation",
                min = 1,
                max = 6,
                value = 3),

    checkboxInput(inputId = "indiv_obs",
                  label = "Show individual observations",
                  value = FALSE),

    checkboxInput(inputId = "density",
                  label = "Show density estimate",
                  value = FALSE),

    conditionalPanel(condition = "input.density == true",
                     sliderInput(inputId = "bw_adjust",
                                 label = "Bandwidth Adjustment",
                                 min = 0.2,
                                 max = 2,
                                 value = 1,
                                 step = 0.2))
  ),
  mainPanel(
    tabsetPanel(
      tabPanel("Plot", 
               plotOutput(
                 outputId = "histogram", 
                 height = "400px",
                 width = "400px")),
      tabPanel("Summary",
               verbatimTextOutput(outputId = "datsummary"))
    ))
)
)

server.R

library(shiny)

# Define server logic required to generate and plot a random distribution
shinyServer(function(input, output) {

  data <- reactive(rnorm(
    n = input$size, 
    mean = input$mu, 
    sd = input$sd
  ))

  output$histogram <- renderPlot({

    hist(data(),
         probability = TRUE,
         xlab = "Data",
         ylab = "Density",
         main = "Histogram of Random Samples")

    if(input$indiv_obs){
      rug(data())
    }

    if(input$density){
      dens <- density(data(), adjust = input$bw_adjust)
      lines(dens, col = "blue")
    }

  })

  output$datsummary <- renderPrint(summary(data()))
})

Any help is greatly appreciated!

Answer 1

I figure it now, I inspect the html code of the app on Shiny Homepage. And the tabsetPanel is adjusted using the <div> (Document Division) tag in html by setting the option class to either span1, span2, span3 and so on. The higher the suffix of the span the larger the width of the division. And I just add div() tag in my ui.R code:

div(
      tabsetPanel(
        tabPanel("Plot", 
                 plotOutput(
                   outputId = "histogram", 
                   height = "400px",
                   width = "400px")),
        tabPanel("Summary",
                 verbatimTextOutput(outputId = "datsummary"))
        ), class = "span7")