Match stale data overlay styling

src/features/online-board/components/StaleDataOverlay.scss

@@ -1,16 +1,11 @@
 .stale-data-overlay {
   position: fixed;
-  inset: 0;
-  z-index: 9999;
-  display: flex;
-  align-items: flex-start;
-  justify-content: center;
-  box-sizing: border-box;
-  padding: 20vh 24px 24px;
-  background: rgb(255 255 255 / 70%);
-  color: #111827;
-  font-size: 18px;
-  font-weight: 600;
-  line-height: 1.4;
+  top: 0;
+  left: 0;
   text-align: center;
+  padding-top: 20%;
+  width: 100%;
+  height: 100%;
+  background-color: rgb(255 255 255 / 70%);
+  z-index: 9999;
 }

tests/e2e/online-board.spec.ts

@@ -284,10 +284,17 @@ test.describe("Online Board", () => {
       timeout: 10000,
     });
 
-    await expect(page.locator('[data-testid="stale-data-overlay"]')).toHaveText(
+    const overlay = page.locator('[data-testid="stale-data-overlay"]');
+    await expect(overlay).toHaveText(
       "Данные устарели, обновите страницу!",
       { timeout: 2000 },
     );
+    await expect(overlay).toHaveCSS("position", "fixed");
+    await expect(overlay).toHaveCSS("top", "0px");
+    await expect(overlay).toHaveCSS("left", "0px");
+    await expect(overlay).toHaveCSS("text-align", "center");
+    await expect(overlay).toHaveCSS("background-color", "rgba(255, 255, 255, 0.7)");
+    await expect(overlay).toHaveCSS("z-index", "9999");
   });
 
   test("route results redirect to main page after stale-data stop timeout", async ({