## Bug description

Sites built with Tailwind use a lot of classes like: `text-base leading-6 font-medium text-gray-500 hover:text-gray-900 focus:outline-none focus:text-gray-900 transition ease-in-out duration-150` 

The problem is with the ones that have a colon (`:`) inside them. Simmerjs crashes with the following:

```
Failed to execute 'querySelectorAll' on 'Document': 'A.text-base.leading-6.text-gray-400.hover:text-gray-500.hover:text-white' is not a valid selector
```

... bringing down the entire toolbar.

## Expected behavior

The toolbar shouldn't crash when your page contains a CSS class with a colon in it.

https://stackoverflow.com/questions/45110893/select-elements-by-attributes-with-colon

## How to reproduce

1. Make a page with a `<button />` that has a class `with:colon`.
2. Wait for a few events to be captured or click the button yourself
3. Open the toolbar, click "heatmap" and watch it burst up in flames (and then crash)

posthog/test/test_event_model.py
action_sign_up = Action.objects.create(team=self.team, name="signed up")
        ActionStep.objects.create(
            action=action_sign_up, tag_name="button", text="Sign up!", event="$autocapture",
        )
        
        ActionStep.objects.create(
            action=action_sign_up, tag_name="button", text="Sign up!", event="$autocapture",
        )
        action_credit_card = Action.objects.create(team=self.team, name="paid")
        ActionStep.objects.create(
            action=action_credit_card, tag_name="button", text="Pay $10", event="$autocapture",
        )
        
        person_stopped_after_signup = Person.objects.create(distinct_ids=["stopped_after_signup"], team=self.team)
        event_sign_up_1 = self._signup_event("stopped_after_signup")
        self.assertEqual(event_sign_up_1.actions, [action_sign_up])
    def test_selector(self):
        action_watch_movie = Action.objects.create(team=self.team, name="watch movie")
        ActionStep.objects.create(
            action=action_watch_movie, text="Watch now", selector="div > a.watch_movie", event="$autocapture",
        )
        Person.objects.create(distinct_ids=["watched_movie"], team=self.team)
        event = self._movie_event("watched_movie")
        self.assertEqual(event.actions, [action_watch_movie])
    def test_attributes(self):