diff --git a/static/js/cookbookServe.js b/static/js/cookbookServe.js
index 8ee8c5c..e353950 100644
--- a/static/js/cookbookServe.js
+++ b/static/js/cookbookServe.js
@@ -949,9 +949,24 @@ function _rerenderCachedModels() {
           document.body.appendChild(popup);
           panel._gpuProbe.popup = popup;
 
+          // Position below the button using viewport coords (popup is
+          // position:fixed). Measure the popup AFTER it's in the DOM so
+          // we get the real rendered size, then clamp both axes so the
+          // popup stays fully visible — GPU buttons near the right edge
+          // of the modal previously anchored the popup mostly off-screen.
           const r = anchorBtn.getBoundingClientRect();
-          popup.style.left = `${Math.max(8, r.left)}px`;
-          popup.style.top  = `${r.bottom + 4 + window.scrollY}px`;
+          const vw = window.innerWidth  || document.documentElement.clientWidth;
+          const vh = window.innerHeight || document.documentElement.clientHeight;
+          const pw = popup.offsetWidth  || 320;
+          const ph = popup.offsetHeight || 200;
+          let left = r.left;
+          let top  = r.bottom + 4;
+          // Push left so the popup doesn't overflow the right edge.
+          if (left + pw > vw - 8) left = Math.max(8, vw - pw - 8);
+          // If there isn't room below, render above the button instead.
+          if (top + ph > vh - 8) top = Math.max(8, r.top - ph - 4);
+          popup.style.left = `${left}px`;
+          popup.style.top  = `${top}px`;
 
           popup.querySelector('.cookbook-gpu-popup-close')?.addEventListener('click', _closeProbePopup);
           popup.querySelectorAll('.cookbook-gpu-kill').forEach(btn => {
diff --git a/static/style.css b/static/style.css
index 52c7c70..cd36f2d 100644
--- a/static/style.css
+++ b/static/style.css
@@ -17773,8 +17773,12 @@ body.gallery-selecting .gallery-dl-btn,
 .cookbook-gpu-clear:disabled { opacity: 0.4; cursor: wait; }
 /* GPU probe popup — per-GPU process list with kill buttons */
 .cookbook-gpu-popup {
-  position: absolute;
-  z-index: 240;
+  /* Fixed positioning (relative to viewport) so we never get pulled into
+     a scrolling/transform stacking context from an ancestor. Z-index has
+     to clear the cookbook modal (260) and the rest of the high-z UI
+     layers (themed-confirm and various overlays sit around 9000-10000). */
+  position: fixed;
+  z-index: 10010;
   min-width: 280px;
   max-width: 420px;
   background: var(--panel, #1a1a1a);