diff --git a/src/assets/swisstopo.json b/src/assets/swisstopo.json
index ae6ad65..8b85802 100644
--- a/src/assets/swisstopo.json
+++ b/src/assets/swisstopo.json
@@ -2160,7 +2160,7 @@
       "minzoom": 12,
       "paint": {
         "fill-antialias": false,
-        "fill-color": "rgba(50, 0, 255, 0.3)",
+        "fill-color": "rgba(50, 0, 255, 0.4)",
         "fill-opacity": {"stops": [[12, 0], [12.5, 0.5]]}
       }
     },
diff --git a/src/assets/swisstopo_aerial.json b/src/assets/swisstopo_aerial.json
index 95468b4..717a021 100644
--- a/src/assets/swisstopo_aerial.json
+++ b/src/assets/swisstopo_aerial.json
@@ -146,7 +146,7 @@
       "minzoom": 12,
       "paint": {
         "fill-antialias": false,
-        "fill-color": "rgba(50, 0, 255, 0.3)",
+        "fill-color": "rgba(50, 0, 255, 0.4)",
         "fill-opacity": {"stops": [[12, 0], [12.5, 0.5]]}
       }
     },
diff --git a/src/assets/swisstopo_raster.json b/src/assets/swisstopo_raster.json
index aad3b60..ee4f7ea 100644
--- a/src/assets/swisstopo_raster.json
+++ b/src/assets/swisstopo_raster.json
@@ -146,7 +146,7 @@
       "minzoom": 12,
       "paint": {
         "fill-antialias": false,
-        "fill-color": "rgba(50, 0, 255, 0.3)",
+        "fill-color": "rgba(50, 0, 255, 0.4)",
         "fill-opacity": {"stops": [[12, 0], [12.5, 0.5]]}
       }
     },