Change elevated background color in Nord theme

Closes #27

Author: abdnh

src/addon/themes/Nord.json

@@ -108,7 +108,7 @@
         "CANVAS_ELEVATED": [
             "Background (elevated)",
             "#eceff4",
-            "#434c5e",
+            "#363636",
             "--canvas-elevated"
         ],
         "CANVAS_INSET": [