`elevation-overlay` demo is broken

[hello-smile6]

Describe the bug The elevation-overlay demo fails to run.

To Reproduce Steps to reproduce the behavior:

1. Go to material-components.github.io/material-web/demos/elevation-overlay
2. Observe the content. Or, if you prefer, the absence of it.

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Browser Version (please complete the following information):

• OS: Windows
• Browser: Chromium
• Version: 99.0.4844.74

Additional context It seems like index.js failed to build, based on the content of the first line. An empty commit might fix it...

import{style as t}from"@material/mwc-elevation-overlay/mwc-elevation-overlay-css";

Based on the error in IE11, the CSS for the component might be failing to load while building.

DOM7011: The code on this page disabled back and forward caching. For more information, see: http://go.microsoft.com/fwlink/?LinkID=291337
elevation-overlay
HTML1300: Navigation occurred.
elevation-overlay
SCRIPT5009: 'mwcElevationOverlayCss' is undefined
index.es5.js (1,2)

Based on the build log, it seems that building the CSS failed. https://github.com/material-components/material-web/runs/5677794914?check_suite_focus=true#step:4:520 Chromium DevTools log: material-components.github.io-1648168319660.log

[asyncliz]

Thanks for the bug! We'd welcome a PR to address it

[asyncliz]

Obsolete in M3