Just to be 100% sure on that, since you're using a Chromium-based browser, maybe hit the F12 key (that'll bring up a developer console, likely on the right), then right-click on the Refresh button and choose (something to the effect of; the exact language will vary depending on the browser) "Empty cache and reload the page". I'd hate to think you're loading a locally-cached version of a static home page and ruling out the possibility that the whole domain is down.
I have been in this spot a few times; for me it's almost always been DNS, a Wordpress site I've assumed from someone/somewhere else whose config file references a version of PHP that is not the version on my server and I spaced on confirming it prior to (attempting to) go live, or a SSL certificate mismatch. There are a million things that can take a site offline. When troubleshooting a live site which is losing money and consumer confidence every second, the seconds seem like hours.
