diff --git a/backend/tests/test_sprint186_map_first_geographic_explorer.py b/backend/tests/test_sprint186_map_first_geographic_explorer.py
index 0ebe67f9..d75f1367 100644
--- a/backend/tests/test_sprint186_map_first_geographic_explorer.py
+++ b/backend/tests/test_sprint186_map_first_geographic_explorer.py
@@ -32,6 +32,7 @@ def test_map_first_explorer_is_the_default_product_flow() -> None:
 def test_map_rectangle_drag_is_wired_to_automatic_analysis() -> None:
     workspace = read("frontend/src/components/map/MapWorkspace.tsx")
     geomap = read("frontend/src/components/GeoMap.tsx")
+    styles = read("frontend/src/styles/app.css")
 
     assert "onMapBboxPreview={handleMapBboxPreview}" in workspace
     assert "onMapBboxSelect={handleMapBboxSelect}" in workspace
@@ -45,6 +46,9 @@ def test_map_rectangle_drag_is_wired_to_automatic_analysis() -> None:
     assert "fitDataOnChangeRef.current" in geomap
     assert "map.fitBounds(bounds, { padding: 40, duration: 0 })" in geomap
     assert "resizeObserver.disconnect()" in geomap
+    assert ".geo-map-canvas .map-container" in styles
+    assert "position: absolute;" in styles
+    assert "inset: 0;" in styles
 
 
 def test_dataset_detail_responses_cannot_overwrite_the_latest_map_layer() -> None:
diff --git a/frontend/src/styles/app.css b/frontend/src/styles/app.css
index 1a8383fc..d7fef336 100644
--- a/frontend/src/styles/app.css
+++ b/frontend/src/styles/app.css
@@ -5736,8 +5736,10 @@ section {
 }
 
 .geo-map-canvas .map-container {
-  width: 100%;
-  height: 100%;
+  position: absolute;
+  inset: 0;
+  width: auto;
+  height: auto;
   min-height: 30rem;
   border: 0;
   border-radius: 0;