Page not found (404)

Request Method: GET
Request URL: https://www.triad-sol.co.jp/contact/contact_input.html
Raised by: django.views.static.serve

"/home/www.triad-sol.co.jp/triad_website/static/contact/contact_input.html" does not exist

You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.