diff --git a/app/src/frontend/header.css b/app/src/frontend/header.css
index 449d91cf..bfa5ba5a 100644
--- a/app/src/frontend/header.css
+++ b/app/src/frontend/header.css
@@ -3,7 +3,7 @@
  */
 .main-header {
     z-index: 3000;
-    position: relative;
+    position: absolute;
     top: 0;
     left: 0;
     height: 76px; /* sync with map-container positioning */
diff --git a/app/src/frontend/map/layers/city-base-map-layer.tsx b/app/src/frontend/map/layers/city-base-map-layer.tsx
index 0d99c9c9..8cd3f1af 100644
--- a/app/src/frontend/map/layers/city-base-map-layer.tsx
+++ b/app/src/frontend/map/layers/city-base-map-layer.tsx
@@ -23,7 +23,7 @@ export function CityMap() {
   }, []);
 
   return (
-    <div id="map" style={{ width: '100%', height: '100vh' }}></div>
+    <div id="map" style={{ width: '1100px', height: '100vh' }}></div>
   );
 }