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static/app.js

@@ -684,6 +684,19 @@ function renderVideo(peerId, displayName, stream, source) {
       <video id="${videoId}" autoplay playsinline ${peerId === state.me.id ? "muted" : ""}></video>
       <div class="video-label">${label}</div>
     `;
+    container.onclick = () => {
+      const isFullscreen = container.classList.contains('fullscreen');
+      // Reset all
+      document.querySelectorAll('.video-item').forEach(el => el.classList.remove('fullscreen'));
+
+      if (isFullscreen) {
+        el.videoGrid.classList.remove('has-fullscreen');
+      } else {
+        container.classList.add('fullscreen');
+        el.videoGrid.classList.add('has-fullscreen');
+      }
+    };
+
     el.videoGrid.appendChild(container);
     videoEl = container.querySelector("video");
   }