## 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_watch_movie = Action.objects.create(team=self.team, name="watched movie")
        ActionStep.objects.create(action=action_watch_movie, tag_name="a", href="/movie")
        person = Person.objects.create(distinct_ids=["anonymous_user", "is_now_signed_up"], team=self.team)
        event_watched_movie_anonymous = Event.objects.create(
            distinct_id="anonymous_user", team=self.team, elements=[Element(tag_name="a", href="/movie")],
        )
        event_watched_movie = Event.objects.create(
            distinct_id="is_now_signed_up", team=self.team, elements=[Element(tag_name="a", href="/movie")],
        )
        events = Event.objects.filter_by_action(action_watch_movie)
        self.assertEqual(events[0], event_watched_movie)
        self.assertEqual(events[0].person_id, person.pk)
    def test_no_person_leakage_from_other_teams(self):
        action_watch_movie = Action.objects.create(team=self.team, name="watched movie")
        ActionStep.objects.create(action=action_watch_movie, event="user signed up")
        person = Person.objects.create(distinct_ids=["anonymous_user"], team=self.team)
        event_watched_movie_anonymous = Event.objects.create(
            event="user signed up", distinct_id="anonymous_user", team=self.team
        )
        team2 = Team.objects.create()
        person2 = Person.objects.create(distinct_ids=["anonymous_user"], team=team2)
        events = Event.objects.filter_by_action(action_watch_movie)
        self.assertEqual(len(events), 1)
        self.assertEqual(events[0].person_id, person.pk)
class TestElementGroup(BaseTest):