diff --git a/docs/interface/dashboards.md b/docs/interface/dashboards.md
index 775a847..bb159e4 100644
--- a/docs/interface/dashboards.md
+++ b/docs/interface/dashboards.md
@@ -13,7 +13,9 @@ to a paired screen, such as a wall tablet.
 4. **Publish** when the dashboard is ready.
 
 Edits stay in a draft; paired screens show the published version. On phones,
-tiles stack in one column and dragging is disabled, but settings remain editable.
+tiles stack in one column over the dashboard's ground (its background image,
+or the Glass look's drifting colours) and dragging is disabled, but settings
+remain editable.
 In edit mode, ⌘Z / Ctrl-Z undoes an edit and ⌘⇧Z / Ctrl-Shift-Z redoes it.
 
 A widget can end up below the canvas, for example after the canvas was made
diff --git a/frontend/src/components/Dashboard/DashboardEditor.tsx b/frontend/src/components/Dashboard/DashboardEditor.tsx
index 8a3acb4..28a3d17 100644
--- a/frontend/src/components/Dashboard/DashboardEditor.tsx
+++ b/frontend/src/components/Dashboard/DashboardEditor.tsx
@@ -42,6 +42,7 @@ import { handleError } from "@/utils"
 import { DashboardPalette } from "./DashboardPalette"
 import {
   areaOf,
+  CanvasGround,
   CanvasSurface,
   canvasOf,
   columnsOf,
@@ -657,7 +658,8 @@ export function DashboardEditor({
         )}
         style={root.style}
       >
-        <div className={cn("h-full overflow-y-auto", rail && "pb-20")}>
+        <CanvasGround dashboard={draft} />
+        <div className={cn("relative h-full overflow-y-auto", rail && "pb-20")}>
           <DashboardView
             dashboard={draft}
             stacked
diff --git a/frontend/src/components/Dashboard/PanelSurface.tsx b/frontend/src/components/Dashboard/PanelSurface.tsx
index c3c4a2a..39677f6 100644
--- a/frontend/src/components/Dashboard/PanelSurface.tsx
+++ b/frontend/src/components/Dashboard/PanelSurface.tsx
@@ -2,6 +2,7 @@ import { useCallback } from "react"
 
 import type { Dashboard } from "@/components/Dashboard/DashboardView"
 import {
+  CanvasGround,
   CanvasSurface,
   DashboardView,
   isRound,
@@ -67,9 +68,14 @@ export function PanelSurface({
         // the look on: this branch mounts what `CanvasSurface` mounts for the
         // other one, touch included.
         <LookProvider dashboard={dashboard} touch={touch}>
+          {/* The look's ground, held to the screen while the stack scrolls
+              over it, as it stays put under a canvas. */}
+          <div className="pointer-events-none fixed inset-0">
+            <CanvasGround dashboard={dashboard} />
+          </div>
           {/* Padded here rather than by the route: the stack overflows this
               box, so only padding inside the overflow clears the rail. */}
-          <div className={cn(rail && "pb-24")}>
+          <div className={cn("relative", rail && "pb-24")}>
             <DashboardView dashboard={dashboard} stacked />
           </div>
           {rail ? (