[CSS] Fix: article header was being selected has the page header.

public/assets/default_theme/css/base.css

@@ -148,7 +148,7 @@ hr {all: unset;display: block;height: 1px;background: var(--bg2);}
 }
 
 /* HEADER AND INSTANCE NAME */
-header {
+#header {
     z-index: 1;
     font-family: var(--display-font);
     font-size: var(--main-size);

public/assets/default_theme/css/pages/feeds.css

@@ -34,7 +34,7 @@
 .h-entry .embed {
     display: flex;
     flex-direction: column;
-    padding: var(--smaller-size);
+    padding: var(--unit-size);
     border: unset;
     width: max-content;
 }

templates/base.html.twig

@@ -69,7 +69,7 @@
 {% block header %}
     {% set extra_header_forms = handle_event('AddExtraHeaderForms', request) %}
 
-    <header>
+    <header id="header">
         {{ block("leftpanel", "stdgrid.html.twig") }}
 
         <a id="anchor-main-page" class="anchor-hidden" title="{{ 'Press tab to access instance\'s main page.' | trans }}"></a>