fix: use iframe directive

Author: agoose77

portal/index.md

@@ -2,7 +2,7 @@
 
 :::{banner}
 :color: rgba(26, 100, 143, 0.9)
-:image: _static/images/backgrounds/pexels-jeff-stapleton-5792818.jpg
+:image: \_static/images/backgrounds/pexels-jeff-stapleton-5792818.jpg
 :caption: Photo by Jeff Stapleton from Pexels
 :class: dark-banner
 :::
@@ -35,7 +35,6 @@ _community-owned_, _geoscience-focused_, and _high-quality_.
     </a>
 </span>
 
-
 ## Start Learning
 
 Project Pythia has several resources for you to use to start learning how to use Python
@@ -202,21 +201,20 @@ and [Outreach Meetings](https://docs.google.com/document/d/e/2PACX-1vQBAt5B24wig
 
 ### Meeting & Event Calendar
 
-<div class="iframe-4x3">
-    <iframe src="https://calendar.google.com/calendar/embed?src=c_4qpvf316afd9mv0ci7d2uiafog%40group.calendar.google.com" frameborder="0" scrolling="no"></iframe>
-</div>
+:::{iframe} https://calendar.google.com/calendar/embed?src=c_4qpvf316afd9mv0ci7d2uiafog%40group.calendar.google.com
+:::
+
 
 ## How to Cite
 
 The material in Project Pythia is licensed for free and open consumption and reuse. All code is served under [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0), while all non-code content is licensed under [Creative Commons BY 4.0 (CC BY 4.0)](https://creativecommons.org/licenses/by/4.0/). Effectively, this means you are free to share and adapt this material so long as you give appropriate credit to the Project Pythia community.
 
 To cite this project, please site our [NSF GEO OSE proposal](https://zenodo.org/record/8184298). Individual components of the project may be cited separately.
 
-> Rose, Brian E. J., Clyne, John, May, Ryan, Munroe, James, Snyder, Amelia, Eroglu, Orhan, & Tyle, Kevin. (2023). Collaborative Research: GEO OSE TRACK 2: Project Pythia and            Pangeo: Building an inclusive geoscience community through accessible, reusable, and reproducible workflows. Zenodo. https://doi.org/10.5281/zenodo.8184298
+> Rose, Brian E. J., Clyne, John, May, Ryan, Munroe, James, Snyder, Amelia, Eroglu, Orhan, & Tyle, Kevin. (2023). Collaborative Research: GEO OSE TRACK 2: Project Pythia and Pangeo: Building an inclusive geoscience community through accessible, reusable, and reproducible workflows. Zenodo. https://doi.org/10.5281/zenodo.8184298
 
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.8184298.svg)](https://doi.org/10.5281/zenodo.8184298)
 
-
 ```{toctree}
 ---
 hidden: True