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<div style="width:500px;font-size:21px;background:#f5f5f5;margin:0 0 40px 100px;padding:1px;border:3px solid black;">
  <div style="text-align:center;margin:10px 0px 0px 0px;"><strong>Table of Contents</strong></div>
  <ul style="float:left;width:33%;list-style-type:none;">
   <li>Book 1.</li>
   <li>Part 1.</li>
   <li><a href="#S1">Section 1.</a></li>
   <li><a href="#S2">Section 2.</a></li>
   <li><a href="#S3">Section 3.</a></li>
  </ul>
  <ul style="float:left;width:33%;list-style-type:none;">
   <li>Book 2.</li>
   <li>Part 1.</li>
   <li><a href="#S4">Section 1.</a></li>
   <li><a href="#S5">Section 2.</a></li>
   <li><a href="#S6">Section 3.</a></li>
  </ul>
  <ul style="float:left;width:33%;list-style-type:none;">
   <li>Book 3.</li>
   <li>Part 1.</li>
   <li><a href="#S7">Section 1.</a></li>
   <li><a href="#S8">Section 2.</a></li>
   <li><a href="#S9">Section 3.</a></li>
  </ul>
</div>