fixed the format of into

index.html

@@ -462,7 +462,7 @@
 <div class="container is-max-desktop">
     <!-- Abstract. -->
 <div class="columns is-centered has-text-centered">
-<h2>Introduction to Jailbreak Attacks and Defenses</h2>
+  <h2 class="title is-3">Introduction to Jailbreak Attacks and Defenses</h2>
 <div class="content has-text-justified">
 <p>We summarized some recent advances in <strong>Jailbreak Attack</strong> and <strong>Jailbreak Defense</strong> in the below table: </p>
 <div id="tabs">