diff --git a/web/static/map.js b/web/static/map.js
index 73a3391..6ef4996 100644
--- a/web/static/map.js
+++ b/web/static/map.js
@@ -19,6 +19,7 @@
         maxBounds: latLngBounds,
         maxBoundsViscosity: 1.0,
         zoomSnap: 0,
+        zoomDelta: 0.5,
         crs: L.CRS.Simple,
     });
     map.fitBounds(latLngBounds);