diff --git a/make_post_sell/static/css/common.css b/make_post_sell/static/css/common.css
index a12b0ee..76e43d1 100644
--- a/make_post_sell/static/css/common.css
+++ b/make_post_sell/static/css/common.css
@@ -1420,9 +1420,10 @@ textarea.markup-editor-textarea {
         order: 4;
     }
 
-    /* Watch mode mobile: video sticks at top, nothing scrolls over it */
+    /* Watch mode mobile: dissolve watch-left wrapper so sticky video sticks
+       against the full grid container, not just the watch-left box */
     .watch-left {
-        order: 1;
+        display: contents;
     }
 
     .watch-mode .product-images {
@@ -1533,6 +1534,14 @@ textarea.markup-editor-textarea {
         grid-area: auto;
     }
 
+    /* Desktop watch mode: content scrolls under sticky video */
+    .watch-mode .product-description,
+    .watch-mode .product-comments {
+        position: relative;
+        z-index: 5;
+        background: var(--bg-primary, #ffffff);
+    }
+
     .watch-mode section.product-right {
         grid-area: purchase;
         align-self: start;
@@ -2653,6 +2662,19 @@ textarea {
     height: auto;
 }
 
+/* Container fullscreen — promoted from <video> for seamless crossfade */
+.watch-video-container:fullscreen,
+.watch-video-container:-webkit-full-screen {
+    background: black;
+    display: grid;
+    place-items: center;
+}
+.watch-video-container:fullscreen > video,
+.watch-video-container:-webkit-full-screen > video {
+    max-height: 100vh;
+    max-width: 100vw;
+}
+
 /* Incoming video during DJ crossfade — z-index above active */
 .crossfade-incoming {
     z-index: 2;