<div id="cat">
  <div id="head">
    <div class="eyes" id="left-eye"></div>
    <div class="eyes" id="right-eye"></div>
    <div id="nose"></div>
    <div class="whiskers"></div>
    <div class="whiskers"></div>
    <div class="mouth">
      <div id="tongue"></div>
      <div id="line"></div>
      <div class="mouth-curve" id="right-curve"></div>
      <div class="mouth-curve" id="left-curve"></div>
    </div>
  </div>
  <div class="ear" id="left-ear"></div>
  <div class="ear" id="right-ear"></div>
</div>