Update index.html

Author: LauraPollacci

index.html

@@ -3,6 +3,7 @@
 # Index page
 ---
 
-<div class="alert alert-warning text-center" role="alert" style="margin: 1rem 0;">
+
+<div style="padding: 1rem; background: yellow; text-align: center; font-weight: bold; font-size: 1.2rem;">
     🚧 Site under construction 🚧
-  </div>
+  </div>