Herokuで正常に表示できません

Question

https://railstutorial.jp/chapters/static_pages?version=5.1#cha-static_pages

上記サイトで3章終わったとこなんですが、
Herokuにプッシュしたら「Method Not Allowed」としか出ません。

Cloud9のテスト環境では正常に表示されてます。
助言お願いします。

ec2-user:/environment/sample_app (master) $ git add -A
ec2-user:/environment/sample_app (master) $ git commit -m "Complete advanced setup"
[master 107775b] Complete advanced setup
3 files changed, 60 insertions(+)
create mode 100644 Guardfile
ec2-user:/environment/sample_app (master) $ git push
Counting objects: 6, done.
Compressing objects: 100% (6/6), done.
Writing objects: 100% (6/6), 1.24 KiB | 1.24 MiB/s, done.
Total 6 (delta 4), reused 0 (delta 0)
To bitbucket.org:vitch_n_hodh/sample_app.git
33e198d..107775b master -> master
ec2-user:/environment/sample_app (master) $ git commit -m "Complete advanced setup"
On branch master
Your branch is up-to-date with 'origin/master'.
nothing to commit, working tree clean
ec2-user:~/environment/sample_app (master) $ git push heroku
Counting objects: 6, done.
Compressing objects: 100% (6/6), done.
Writing objects: 100% (6/6), 1.24 KiB | 1.24 MiB/s, done.
Total 6 (delta 4), reused 0 (delta 0)
remote: Compressing source files... done.
（略）
remote: https://polar-waters-62934.herokuapp.com/ deployed to Heroku
remote:
remote: Verifying deploy... done.
To https://git.heroku.com/polar-waters-62934.git
33e198d..107775b master -> master