Updated LoG tutorial page accordingly

Author: marshka

_tutorials/graph-based-processing/log-2024.html

@@ -5,7 +5,7 @@
 description: The GMLG tutorial on graph deep learning for time-series processing.
 venue: LoG Conference 2024
 city: Virtual & Siena, Italy
-image: tutorials/graph-based-processing/img/thumb.jpg?v=2
+image: tutorials/graph-based-processing/img/log_siena_thumb.jpg
 ---
 <!-- Outline section-->
 <section>
@@ -65,7 +65,7 @@ <h1>Material</h1>
 </section>
 <!-- Location section-->
 <section class="text-white py-0"
-    style="background-image: url(./img/siena-background.jpg); background-attachment: fixed; background-size: cover;">
+    style="background-image: url(./img/siena-background.jpg); background-attachment: fixed; background-size: cover; background-position: center;">
     <div class="w-100 h-100 py-5" style="backdrop-filter: brightness(0.5) blur(3px);">
         <div class="container px-4">
             <div class="row gx-4 justify-content-center">