ode>price</code> under the <code>book</code> option of <code>config.yml</code> file:</p>

<div class="code code">
<pre class="code">book:
    ...
    price: 10</pre>
</div>

<p>Now you can use this option in any template with the following expression: <code>{{ book.price }}</code>.  Do you want to use different CSS frameworks to generate the book website? Add a new option called <code>framework</code> in some editions:</p>

<div class="code code">
<pre class="code">editions:
    my_website1:
        format: