title: Changing the font size of valueBoxes
body: <p>I would like to change the font size of the value and the subtitle for <code>valueBox</code>es.</p>
  
  <p>Below is my attempt, but would be grateful of any suggestions on how to change it in a way that looks similar to the default look. Below is my reporducible example.</p>
  
  <pre><code>require(shinydashboard)
  
  valueBox2 &lt;- function (value,header_val=4, subtitle, icon = NULL, color = "aqua", width = 4, 
                         href = NULL) {
    shinydashboard:::validateColor(color)
    if (!is.null(icon)) 
      shinydashboard:::tagAssert(icon, type = "i")
    boxContent &lt;- div(class = paste0("small-box bg-", color), 
                      div(class = "inner", eval(parse(text=paste0('h',header_val,'(',shQuote(value),')'))), p(subtitle)), if (!is.null(icon)) 
                        div(class = "icon-large", icon))
    if (!is.null(href)) 
      boxContent &lt;- a(href = href, boxContent)
    div(class = if (!is.null(width)) 
      paste0("col-sm-", width), boxContent)
  }
  
  ui = dashboardPage(title='hello',
    dashboardHeader(title='hello2'),
    dashboardSidebar(
      sliderInput('hval',label='header value',min=1,max=6,value=3)
    ),
    dashboardBody(
      valueBoxOutput('tmp')
    )
  )
  
  server = function(input, output) {
    output$tmp &lt;- renderValueBox({
      valueBox2(value='90k',header_val = input$hval, subtitle='some long descritptive text',icon=icon("car"))
      })
  }
  
  shinyApp(ui=ui,server=server)
  </code></pre>