title: Changing menu icon in shiny dashboard
body: <p>The following css style corresponds to the menu icon in a shiny dashboard. I want to change it. I tried with <code>tags$head(tags$style..</code> in the body, but it didn't work. Any ideas?</p>
  
  <pre><code>.main-header .sidebar-toggle:before {
      content: "\f0c9";
  }
  </code></pre>