Fix nested double-quote

Co-authored-by: Julia Kent <[email protected]>

Author: ktyle

portal/index.md

@@ -9,7 +9,7 @@
 
 <span style="font-size: 2.6rem;">An education and training hub for the geoscientific Python community</span>
 
-<a href="posts/binderhub_status.html" role="button" class="btn btn-light btn-lg" style="display: flex; align-items: center; font-weight: 600; text-decoration: none; background-color: "orange"; border: rgba(var(--spt-color-dark), 1);">
+<a href="posts/binderhub_status.html" role="button" class="btn btn-light btn-lg" style="display: flex; align-items: center; font-weight: 600; text-decoration: none; background-color: orange; border: rgba(var(--spt-color-dark), 1);">
          Pythia BinderHub Maintenance Monday Dec. 19, 2024
  </a>