CSS for redacted events

[dbkr]

matrix-org/matrix-react-sdk#739 needs better CSS

#3379 is the working CSS

[ara4n]

before I try to fix up the CSS for this, please can the visible redaction be tweaked to display the sender's name, message timestamp, etc? I assumed that folks knew what a redaction looked like, but the idea is something like this:

Obviously we don't know the right size of black-out to use, so i'd suggest just making it 30 characters wide or something.

To be explicit, I think a sensible appearance would be:

[lukebarnard1]

@ara4n we can't show sender or TS until JS-SDK doesn't redact origin_server_ts or sender. See matrix-org/matrix-js-sdk#387

Also, thanks for the explicit design.

.mx_EventTile.mx_EventTile_redacted {
    max-width: 400px;
    margin-left: 63px;
}

would make it look as you suggest.