title: Change width of valueBox in RShiny
body: <p>I'm creating value boxes like this:</p>
  <pre><code>valueBox(value = tags$p(winterMean, style = &quot;font-size: 70%;&quot;), 
                     subtitle = tags$p(&quot;Mean Winter Performance \u20ac / MWh&quot;, style = &quot;font-size: 90%;&quot;), 
                     color = &quot;black&quot;)
  </code></pre>
  <p>Which yields the following <code>valueBox()</code>:</p>
  <p><a href="https://i.stack.imgur.com/RhbEM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RhbEM.png" alt="enter image description here" /></a></p>
  <p>The color black is defined in th <code>ui.R</code> file like this:</p>
  <pre><code>tags$head(
    tags$style(&quot;.small-box.bg-black { background-color: #007d3c !important; color: #FFFFFF !important; }&quot;)
  )
  </code></pre>
  <p>How can I change the width of the <code>valueBox</code> to the red line?</p>