diff --git a/public/templates/data.tmpl b/public/templates/data.tmpl
index 82561aa..a09392e 100644
--- a/public/templates/data.tmpl
+++ b/public/templates/data.tmpl
@@ -127,7 +127,7 @@
           "source": "contour",
           "source-layer": "contours",
           "paint": {
-            "line-opacity": 0.5,
+            "line-opacity": 1,
             "line-width": ["match", ["get", "level"], 1, 1, 0.5]
           }
         },