title: Chart.js: Change width of tooltip
body: <p>I want to change the width of the toopltip in Chart.js.
  The reason is that the tooltips hide under iFrame if they are to wide.</p>
  
  <p>I tried to move them but i only found the option <code>position: 'nearest'</code>.
  But that doesn't solve the problem.</p>
  
  <p>Is there no option to set the width of the tooltip to 200px (with line breaks)?</p>
  
  <p>I only found options for border width or font size (which should be bigger).</p>