Merge branch '47964-custom-logo-rendering-improperly-on-sign-in-page-2' into 'master'

Resolve "Custom logo rendering improperly on sign-in page"

Closes #47964

See merge request gitlab-org/gitlab-ce!20037

app/assets/stylesheets/framework/header.scss

@@ -558,7 +558,7 @@
   background: $white-light;
   border-bottom: 1px solid $white-normal;
 
-  .center-logo {
+  .mx-auto {
     margin: 8px 0;
     text-align: center;