Adjust colors

Author: tilenkavcic

fern/docs/pages/airdrop/extraction-phases.mdx

@@ -16,11 +16,11 @@ sequenceDiagram
         'primaryColor': '#4285F4',
         'primaryTextColor': '#fff',
         'primaryBorderColor': '#7570b3',
-        'lineColor': '#555',
+        'lineColor': '#363535',
         'secondaryColor': '#f8f8f8',
         'tertiaryColor': '#f4f4f4',
-        'signalColor': '#7d7f7c',
-        'signalTextColor': '#7d7f7c'
+        'signalColor': '#363535',
+        'signalTextColor': '#363535'
 }}}%%
   actor user as User
   participant gw as REST API Gateway