diff --git a/src/web/public/styles.css b/src/web/public/styles.css
index aca95c6d..e972d6f8 100644
--- a/src/web/public/styles.css
+++ b/src/web/public/styles.css
@@ -19557,10 +19557,6 @@ html[data-session-list="sidebar"][data-sidebar="collapsed"] .btn-sidebar-toggle
   background: var(--accent, #4a9eff);
 }
 
-.tile-grid.tile-grid--zoomed .tile-divider {
-  display: none;
-}
-
 /* While a divider drags: the resize cursor everywhere and no text selection
    (mirrors body.split-pane-resizing). */
 body.tile-grid-resizing,
@@ -19592,10 +19588,6 @@ body.tile-grid-resizing--row * {
   opacity: 0.6;
 }
 
-.tile-grid.tile-grid--zoomed .tile-slot {
-  display: none;
-}
-
 /* A tab dragged over a tile (replace it) or an empty slot (add it). */
 .tile.tile--drop-target,
 .tile-slot.tile--drop-target {
diff --git a/test/tile-grid-dividers.test.ts b/test/tile-grid-dividers.test.ts
index 4071c8f7..9f3e7604 100644
--- a/test/tile-grid-dividers.test.ts
+++ b/test/tile-grid-dividers.test.ts
@@ -12,8 +12,6 @@
  *
  * Real code via the shared vm harness (test/mocks/tile-grid-vm.ts). Port: N/A.
  */
-import { readFileSync } from 'node:fs';
-import { resolve } from 'node:path';
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 import {
   FakeEl,
@@ -204,11 +202,13 @@ describe('fractions on fewer columns', () => {
 });
 
 describe('zoomed', () => {
-  it('shows no dividers', () => {
+  it('has no dividers while a tile fills the grid, and gets them back on restore', () => {
     const app = grid(['s-a', 's-b', 's-c', 's-d']);
+    const dividerEls = () => section.children.filter((el) => el.className.startsWith('tile-divider'));
     app.zoomTile('s-a');
     expect(app._tileGrid.dividers.size).toBe(0);
-    const css = readFileSync(resolve(import.meta.dirname, '../src/web/public/styles.css'), 'utf8');
-    expect(css).toMatch(/\.tile-grid\.tile-grid--zoomed \.tile-divider\s*\{\s*display: none;/);
+    expect(dividerEls()).toHaveLength(0);
+    app.zoomTile('s-a');
+    expect(dividerEls()).toHaveLength(2);
   });
 });
diff --git a/test/tile-grid-entry-points.test.ts b/test/tile-grid-entry-points.test.ts
index fe4b56b4..2c181677 100644
--- a/test/tile-grid-entry-points.test.ts
+++ b/test/tile-grid-entry-points.test.ts
@@ -120,6 +120,15 @@ describe('dragging a tab onto an empty slot', () => {
     app.openTileGrid(['s-a', 's-b']);
     expect(slots()).toHaveLength(0);
   });
+
+  it('a zoomed grid has no slot; restoring the grid brings it back', () => {
+    const app = makeGridApp(IDS);
+    app.openTileGrid(IDS);
+    app.zoomTile('s-a');
+    expect(slots()).toHaveLength(0);
+    app.zoomTile('s-a');
+    expect(slots()).toHaveLength(1);
+  });
 });
 
 describe('Ctrl/Cmd+click on a tab', () => {