title: Transparent editor background in TinyMCE 5
body: <p>I would like to change the background color of the TinyMCE editor to transparent.
  I managed to do so in TinyMCE 4, but the same method seems not to be working in TinyMCE 5.</p>
  
  <p>The method I used in TinyMCE4 was:</p>
  
  <pre><code>  tinymce.init(
     {
      plugins: 'link',
      'force_br_newlines' : true,
      'force_p_newlines' : false,
      'forced_root_block' : 'div',
      width:'99%',
      height: '100%',
      resize: false,
      menubar: false,
      skin: 'kairos',
      statusbar: false,
      plugins : "inlinepopups,insertdatetime,fullscreen",
      body_id:'mission',
      toolbar: 'undo redo | bold italic underline strikethrough | link',
      branding:false,
      init_instance_callback : editorInitialized,
      selector: '#missstat'
     });
  </code></pre>
  
  <p>and</p>
  
  <pre><code>function editorInitialized()
   {
    b = tinyMCE.editors['missstat'].getWin().document.body;
    $(b).css({'color':'#000000','background-color':'rgba(0,0,0,0)','color':'#FFFFFF'});
    $('.mce-edit-area, .mce-tinymce').css({'background-color':'rgba(0,0,0,0)'});
   }
  </code></pre>
  
  <p>I found out, that I can change the color of the editor by using rgba(0,0,0,.1), which should result in a nearly black, transparent background. In stead, the background turns blueish, and not very transparent. If I use rgba(0,0,0,0), the background just stays white (#FFFFFF) which is default in the theme I am using (note: I copied the oxide-dark theme to "kairos", just to be able to edit in the theme, but until now I haven't been editing anything yet).</p>
  
  <p>Perhaps, the classes "mce-edit-area" and "mce-tinymce" have changed name in TinyMCE 5 (in comparison to TinyMCE 4).</p>
  
  <p>So my question is: How do I change the background color to transparent?</p>
  
  <p>Note 2: I also tried "transparent" in stead of rgba(0,0,0,0), this doesn't work either.</p>