Make friends with a Babel Fish.

user/themes/textbook/css/custom.css

 
+/* Ensures the footer stays on the bottom of the page */
+#page-wrapper {
+    min-height: calc(100vh - 3rem);
+}
 
 #footer {
     height: 3rem;

user/themes/textbook/css/portal.css

+#start a {
+    font-size: 5em;
+    padding: 0 0.5em;
+}
\ No newline at end of file

user/themes/textbook/templates/partials/footer.html.twig

 <section id="footer" class="section bg-gray">
     <section class="container {{ grid_size }}">
-        <p><a href="https://m3p2.org">M3P2</a> was <i class="fa fa-code"></i> with <i class="fa fa-heart-o pulse"></i> by <a href="https://www.ljbac.com" class="ljbac"><i class="fa fa-cube"></i></a> with <a href="http://getgrav.org">Grav</a>.</p>
+        <p><a href="https://m3p2.org">M3P2</a> was <i class="fa fa-code"></i> with <i class="fa fa-heart-o pulse"></i> by <a href="/authors" class="science"><i class="fa fa-flask"></i></a> and <a href="https://www.ljbac.com" class="ljbac"><i class="fa fa-cube"></i></a> with <a href="http://getgrav.org">Grav</a>.</p>
     </section>
 </section>

user/themes/textbook/templates/portal.html.twig

+{% extends 'default.html.twig' %}
+
+{% block stylesheets %}
+    {% do assets.addCss('theme://css/portal.css') %}
+    {{ parent() }}
+{% endblock %}
\ No newline at end of file