use prism-tomorrow.css

docs/_style/prism-master/examples/prism-ruby.html

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+<h2>Comments</h2>
+<pre><code># This is a comment
+=begin
+Multi-line
+comment
+=end</code></pre>
+
+<h2>Strings</h2>
+<pre><code>"foo \"bar\" baz"
+'foo \'bar\' baz'</code></pre>
+
+<h2>Regular expressions</h2>
+<pre><code>/foo?[ ]*bar/</code></pre>
+
+<h2>Variables</h2>
+<pre><code>$foo = 5;
+class InstTest
+  def set_foo(n)
+    @foo = n
+  end
+  def set_bar(n)
+    @bar = n
+  end
+end</code></pre>
+
+<h2>Symbols</h2>
+<pre><code>mystring = :steveT;</code></pre>
+
+<h2>String Interpolation</h2>
+<pre><code>"foo #{'bar'+my_variable}"</code></pre>