small edits

index.html

@@ -129,7 +129,7 @@ <h2 style="color: red;">Outstanding Student Paper Award Finalist</h2>
                     <a href="https://arxiv.org/abs/2405.03666" target="_blank"
                     class="external-link button is-normal is-rounded is-dark">
                     <span class="icon">
-                      <i class="fa-solid fa-file"></i>
+                      <i class="fa fa-file"></i>
                     </span>
                     <span>Poster</span>
                   </a>