Fix anchor navigation offset for fixed header

Author: Gautam-aman

core/src/main/resources/lib/layout/layout.jelly

@@ -115,6 +115,15 @@ THE SOFTWARE.
     <j:if test="${attrs.nogrid==null or attrs.nogrid.equals(false)}">
       <link rel="stylesheet" href="${resURL}/css/responsive-grid.css" type="text/css" />
     </j:if>
+    <style>
+      /*
+       * Prevent anchor targets from being hidden behind the fixed Jenkins header
+       * See: https://github.com/jenkinsci/jenkins/issues/16803
+       */
+      :target {
+        scroll-margin-top: 4rem;
+      }
+    </style>
     <j:if test="${attrs.css!=null}">
       <link rel="stylesheet" href="${resURL}${attrs.css}" type="text/css" />
     </j:if>

core/src/main/resources/lib/layout/skeleton/skeleton.css

@@ -95,10 +95,3 @@ body:has(.jenkins-form-skeleton) {
     margin: 0 !important;
   }
 }
-/*
- * Prevent anchor targets from being hidden behind the Jenkins header
- * See: https://github.com/jenkinsci/jenkins/issues/16803
- */
-[id] {
-  scroll-margin-top: 4rem;
-}