diff --git a/handbook/computing/hbmanual1.html b/handbook/computing/hbmanual1.html
index 8c2bed544..9bc0c9a34 100644
--- a/handbook/computing/hbmanual1.html
+++ b/handbook/computing/hbmanual1.html
@@ -57,7 +57,7 @@ so you cannot use "Edit this page". These pages will not show "Edit this page" i
 <ul>
 <li>We specify that pages are encoded using <a href="https://www.w3schools.com/charsets/ref_html_utf8.asp">UTF-8</a> for all content.
 <li>We are using <a href="https://www.w3schools.com/html/html5_intro.asp">HTML5</a> and
- <a href="https://developer.mozilla.org/en-US/docs/Archive/CSS3">CSS3</a> but a great many pages still use obsolescent tags such as &lt;font&gt;. These are being removed whenever a page is edited.
+ <a href="https://developer.mozilla.org/en-US/docs/Web/CSS">CSS3</a> but a great many pages still use obsolescent tags such as &lt;font&gt;. These are being removed whenever a page is edited.
  <li>All the pages use a single CSS stylesheet <a href="/css/main2.css">/css/main2.css</a>. 
  <li>We do not use any javascript framework: just HTML and CSS. You may come across historic references to jquery but this is not used.
 <li>When editing webpages, use <a href="https://www.freeformatter.com/html-entities.html">HTML entities</a> for characters with umlauts, e.g. <em>&amp;ouml;</em> for &ouml;.