Changing the font size of valueBoxes
<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>