ホームページビルダーSPでGoogle Mapを使うと、HTTPS化が。。。

Mixed Content: The page at ‘https://20180925.hpb18.org/access1.html’ was loaded over HTTPS, but requested an insecure script ‘http://maps.google.com/maps/api/js?sensor=false&key=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX-3s’. This request has been blocked; the content must be served over HTTPS.
sp-google-map-1.js:34 Uncaught ReferenceError: google is not defined
at hpbmaponload_sp_google_map_1 (sp-google-map-1.js:34)
at HTMLDocument.<anonymous> (access1.html:12)
at o (jquery.min.js:2)
at Object.fireWith (jquery.min.js:2)
at Function.ready (jquery.min.js:2)
at HTMLDocument.B (jquery.min.js:2)