update index.html to match README.md

Former-commit-id: fd3496a90ba96c7175c45f1e70022f436ebf4c5e

index.html

@@ -118,17 +118,19 @@ caution.</p>
 <p>We really heavily on Eigen. Nearly all inputs and outputs are Eigen matrices of
 some kind. However, we currently <em>only</em> support Eigen&#8217;s default column-major
 ordering. That means, we <strong>do not</strong> expect our code to work for matrices using
-the <code>Eigen::RowMajor</code> flag. If you can, change definitions like:
-<code>cpp
-Eigen::Matrix&lt;double, Eigen::Dynamic, 3, Eigen::RowMajor&gt; A;
-</code>
-to
-<code>cpp
-Eigen::Matrix&lt;double, Eigen::Dynamic, 3, Eigen::ColMajor&gt; A;
+the <code>Eigen::RowMajor</code> flag. If you can, change definitions like:</p>
+
+<pre><code class="cpp">Eigen::Matrix&lt;double, Eigen::Dynamic, 3, Eigen::RowMajor&gt; A;
+</code></pre>
+
+<p>to</p>
+
+<pre><code class="cpp">Eigen::Matrix&lt;double, Eigen::Dynamic, 3, Eigen::ColMajor&gt; A;
 // or simply
 Eigen::Matrix&lt;double, Eigen::Dynamic, 3&gt; A;
-</code>
-We hope to fix this, or at least identify which functions are safe (many of
+</code></pre>
+
+<p>We hope to fix this, or at least identify which functions are safe (many of
 them probably work just fine). This requires setting up unit testing, which is
 a major <em>todo</em> for our development.</p>