Update index.html

index.html

@@ -124,7 +124,7 @@
       <h1 id="tagline">Do you hear it?</h1>
       <p>AVIP probes whether multimodal models actually use <strong>audio</strong> when interpreting videos.</p>
       <a class="btn" href="#media">See examples</a>
-      <video autoplay muted loop playsinline poster="cover.png">
+      <video autoplay muted loop playsinline poster="cover.jpg">
         <source src="thumbnail.mp4" type="video/mp4" />
         <source src="thumbnail.webm" type="video/webm" />
       </video>