Update public/index.html

public/index.html

@@ -269,7 +269,7 @@
         <li data-filter=".filter-sonstiges">Sonstiges</li>
       </ul><!-- End Portfolio Filters -->
 
-      <div class="row gy-6 isotope-container" data-aos="fade-up" data-aos-delay="200">
+      <div class="row gy-4 isotope-container" data-aos="fade-up" data-aos-delay="200">
 
         <!-- Publikationen -->
         <!-- Paper 1 -->