Como ajustar a altura da barra de navegação superior e do banner

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;
}