Hotfix: Fit button size to mobile screens.

Unfortunately, responsive buttons land in 0.9.4 so until
django-simple-bulma has that we can settle for a slightly less
eye-catching button.

Author: kosayoda

pydis_site/templates/events/pages/code-jams/_index.html

@@ -8,14 +8,17 @@
 {% block title %}Code Jams{% endblock %}
 
 {% block event_content %}
-    <div class="buttons are-large is-centered">
-      <a href="9/_index" class="button is-primary">
-        <span>Code Jam 2022 is Coming Up This July!</span>
-        <span class="icon">
-          <i class="fas fa-arrow-right"></i>
+    <div class="block">
+      <a href="9/_index" class="button is-primary mt-1">
+        <span class="icon-text">
+          <span>Code Jam 2022 is Coming This July!</span>
+          <span class="icon">
+            <i class="fas fa-arrow-right"></i>
+          </span>
         </span>
       </a>
     </div>
+
     <p>
         If you've been around the server for a while, or you just happened to join at the right time,
         you may have heard of something known as a Code Jam.