Wie man die Höhe der oberen Navigationsleiste und des Banners anpasst

If you inspect the global notice banner with browser devtools, you can see the div has an id and some classes:

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It normally gets the padding, which affects the banner size, from the .alert class:

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But you can override that just for the Global Notice, like this:

#global-notice-alert-global-notice {
  padding: .2em .5em .2em .5em;
}