diff --git a/antora/supplimental-ui/partials/header-content.hbs b/antora/supplimental-ui/partials/header-content.hbs
index e69de29bb..3df2dec95 100644
--- a/antora/supplimental-ui/partials/header-content.hbs
+++ b/antora/supplimental-ui/partials/header-content.hbs
@@ -0,0 +1,71 @@
+
+
+<header class="header" id="antora-header">
+    <nav class="navbar">
+        <head>
+            <link data-rh="true" rel="icon" href="/img/favicon.ico">
+            <link data-rh="true" rel="canonical" href="https://developer.riscv.org/ref">
+            <link data-rh="true" rel="alternate" href="https://developer.riscv.org/ref" hreflang="en">
+            <link data-rh="true" rel="alternate" href="https://developer.riscv.org/ref" hreflang="x-default">
+            <link data-rh="true" rel="preconnect" href="https://MGVPU7BN22-dsn.algolia.net" crossorigin="anonymous">
+            <link rel="stylesheet" type="text/css" href="/docs/reference/_/docusaurus-styles-copy-08-25.css">
+
+        </head>
+        <script>
+            !function(){function t(t){document.documentElement.setAttribute("data-theme",t)}var e=function(){try{return new URLSearchParams(window.location.search).get("docusaurus-theme")}catch(t){}}()||function(){try{return window.localStorage.getItem("theme")}catch(t){}}();t(null!==e?e:"light")}(),function(){try{const a=new URLSearchParams(window.location.search).entries();for(var[t,e]of a)if(t.startsWith("docusaurus-data-")){var n=t.replace("docusaurus-data-","data-");document.documentElement.setAttribute(n,e)}}catch(t){}}(),document.documentElement.setAttribute("data-announcement-bar-initially-dismissed",function(){try{return"true"===localStorage.getItem("docusaurus.announcement.dismiss")}catch(t){}return!1}())
+        </script>
+            <link rel="preload" as="image" href="/img/logo.svg">
+            <div role="region" aria-label="Skip to main content"><a class="skipToContent_fXgn" href="#__docusaurus_skipToContent_fallback">Skip to main content</a></div>
+            <div class="announcementBar_mb4j" role="banner">
+                <div class="announcementBarPlaceholder_vyr4"></div>
+                <div class="content_knG7 announcementBarContent_xLdY">congratulations, you found the RISC-V Developer Portal! 🎉 . This site is under active development and not meant for public consumption yet.</div><button type="button" aria-label="Close" class="clean-btn close closeButton_CVFx announcementBarClose_gvF7"><svg viewBox="0 0 15 15" width="14" height="14"><g stroke="currentColor" stroke-width="3.1"><path d="M.75.75l13.5 13.5M14.25.75L.75 14.25"></path></g></svg></button></div>
+            <nav aria-label="Main" class="navbar ">
+                <div class="navbar__inner">
+                    <div class="navbar__items"><button aria-label="Toggle navigation bar" aria-expanded="false" class="navbar__toggle clean-btn" type="button"><svg width="30" height="30" viewBox="0 0 30 30" aria-hidden="true"><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"></path></svg></button>
+                        <a class="navbar__brand" href="/">
+                            <div class="navbar__logo"><img src="/img/logo.svg" alt="RISC-V Logo" class="themedComponent_mlkZ themedComponent--light_NVdE"><img src="/img/logo.svg" alt="RISC-V Logo" class="themedComponent_mlkZ themedComponent--dark_xIcU"></div><b class="navbar__title text--truncate">Home</b></a>
+                        <div class="navbar__item dropdown dropdown--hoverable"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link">Specifications</a>
+                            <ul class="dropdown__menu">
+                                <li><a class="dropdown__link" href="/docs/spec/isa">ISA</a></li>
+                                <li><a class="dropdown__link" href="/docs/spec/profiles">Profiles</a></li>
+                                <li><a class="dropdown__link" docid="spec/non-isa" href="/docs/spec/non-isa">Non-ISA</a></li>
+                            </ul>
+                        </div>
+                        <div class="navbar__item dropdown dropdown--hoverable"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link">Developers</a>
+                            <ul class="dropdown__menu">
+                                <li><a class="dropdown__link" href="/docs/spec/intro">Specification Developers</a></li>
+                                <li><a class="dropdown__link" href="/docs/hardware/overview">Hardware Developers</a></li>
+                                <li><a class="dropdown__link" href="/docs/software/overview">Software Developers</a></li>
+                            </ul>
+                        </div><a class="navbar__item navbar__link" href="/blog">Blog</a><a href="https://riscv.org/community/calendar/" target="_blank" rel="noopener noreferrer" class="navbar__item navbar__link">Events<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></div>
+                        {{#if env.SITE_SEARCH_PROVIDER}}
+                        <div class="navbar-item search hide-for-print">
+                          <div id="search-field" class="field">
+                            <input id="search-input" type="text" placeholder="Search"{{#if page.home}} autofocus{{/if}}>
+                          </div>
+                        </div>
+                        {{/if}}
+                    <div class="navbar__items navbar__items--right">
+
+
+                      <div class="navbarSearchContainer_Bca1">
+
+{{!--                         <button type="button" class="DocSearch DocSearch-Button" aria-label="Search (Command+K)">
+                          <span class="DocSearch-Button-Container">
+                            <svg width="20" height="20" class="DocSearch-Search-Icon" viewBox="0 0 20 20" aria-hidden="true">
+                              <path d="M14.386 14.386l4.0877 4.0877-4.0877-4.0877c-2.9418 2.9419-7.7115 2.9419-10.6533 0-2.9419-2.9418-2.9419-7.7115 0-10.6533 2.9418-2.9419 7.7115-2.9419 10.6533 0 2.9419 2.9418 2.9419 7.7115 0 10.6533z" stroke="currentColor" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path>
+                            </svg>
+                            <span class="DocSearch-Button-Placeholder">Search</span>
+                          </span>
+                          <span class="DocSearch-Button-Keys"></span>
+                        </button>
+ --}}                      </div>
+                    </div>
+                </div>
+                <div role="presentation" class="navbar-sidebar__backdrop"></div>
+            </nav>
+            <div id="__docusaurus_skipToContent_fallback" class="main-wrapper mainWrapper__tJE"></div>
+
+
+    </nav>
+</header>
\ No newline at end of file
