Change the blue to a AA compliant shade

source/_pages/talks.html.twig

@@ -11,7 +11,7 @@ use:
         {% for talk in data.talks|sort((a,b) => a.sortable_date < b.sortable_date) %}
             <article>
                 <h2 class="text-xl">
-                    <a class="text-blue-400" href="{{ talk.url }}">
+                    <a class="text-blue-700" href="{{ talk.url }}">
                         {{ talk.title }}
                     </a>
                 </h2>

source/_partials/navbar.html.twig

@@ -5,7 +5,7 @@
                 <a href="/">
                     <svg
                       aria-hidden="true"
-                      class="w-16 h-16 text-blue-400 fill-current md:w-18 md:h-18"
+                      class="w-16 h-16 text-blue-700 fill-current md:w-18 md:h-18"
                       viewBox="0 0 706 504"
                       xmlns="http://www.w3.org/2000/svg"
                     >