Button header background color

theme/blue/theme.json

@@ -17,6 +17,7 @@
     "gallery-font-size": "35px",
     "gallery-font-size-mobile": "55px",
     "main-bg-color": "#002365",
+    "header-bg-color": "#002365",
     "column-left-color": "#002365",
     "text-entry-background": "#002365",
     "link-bg-color": "#002365",