Bento docs for amp-date-display links to missing stylesheet

[westonruter]

🐛 Bug Report

Current behavior

On the docs for amp-date-display v1.0, the Bento option shows this HTML to copy:

<script async custom-element="amp-date-display" src="https://cdn.ampproject.org/v0/amp-date-display-1.0.js"></script>
<link rel="stylesheet" href="https://cdn.ampproject.org/v0/amp-date-display-1.0.css">

Problem: https://cdn.ampproject.org/v0/amp-date-display-1.0.css is a 404.

This is not a problem for amp-base-carousel v1.0 where it shows:

<script async custom-element="amp-base-carousel" src="https://cdn.ampproject.org/v0/amp-base-carousel-1.0.js"></script>
<link rel="stylesheet" href="https://cdn.ampproject.org/v0/amp-base-carousel-1.0.css">

And the stylesheet URL is OK: https://cdn.ampproject.org/v0/amp-base-carousel-1.0.css

Expected behavior/code

Bento stylesheet link should not 404.

[sebastianbenz]

@caroqliu do you know why amp-date-display hasn't got a CSS file?

[caroqliu]

@caroqliu do you know why amp-date-display hasn't got a CSS file?

No good reason, I'll add now. It also appears to be missing for amp-date-countdown and amp-timeago.