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

Answer 1

A different way to adjust the width of sidebarPanel and tabsetPanel was based on modifying the width property of the col-sm-4 and col-sm-8 CSS classes, respectively.
Using tag$head and tag$style it is possibile to add CSS directly to the Shiny UI.
See https://shiny.rstudio.com/articles/css.html for details.
This is not an elegant solution, but it works correctly.

Shiny UI

shinyUI(fluidPage(
  tags$head(
    tags$style(HTML("   
     .col-sm-4 { width: 25%;}
     .col-sm-8 { width: 75%;}
    "))
  ),       
  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"))
    ))
)
)