Draft: Box-shadow TheiaCon 2022 look

This is just to preview a separate branch to give marketing options to pick from.

content/2021/theiacon/_index.md

@@ -7,7 +7,7 @@ headline: |
 tagline: ''
 summary: 'TheiaCon is a virtual conference focused around the Eclipse Theia IDE ecosystem. It brings together a diverse group of Theia developers, adopters, and other contributors. The program will feature a mix of full-length talks, expert panel discussions and short ”lightning talks” focused on project insider, adopter, and broader ecosystem stories. This event is hosted by the Eclipse Foundation’s Cloud DevTools Working Group and is open to anyone interested in learning more about Cloud IDE development and the Theia project.'
 date: 2021-11-17
-header_wrapper_class: 'header-theiacon-2021-event'
+header_wrapper_class: 'header-theiacon header-theiacon-event header-theiacon-event-2021'
 links:
   [
     [href: '#committee', text: 'Program Committee'],
@@ -45,4 +45,4 @@ layout: 'single'
 {{</ grid/section-container >}}
 
 <!-- Add sponsors section -->
-{{< theiacon/sponsored-by event="theiacon" year="2021" source="members">}}
+{{< theiacon/sponsored-section class="text-center" display_sponsors="true" event="theiacon" year="2021" >}}