title: Vertical paper-slider element
body: <p>I like the Polymer paper elements and I want to use a paper-slider element.</p>
  
  <p>However, i would like it to be vertical. I've tried to apply css to rotate it;</p>
  
  <p><code>transform: rotate(90deg);</code></p>
  
  <p>This rotates the slider, but not the "input"; one must still click and drag the mouse <strong>horizontally</strong> in order to get the "knob" to move up and down. </p>
  
  <p>This is very annoying and any help is rely appreciated!</p>