Hi @Daniëlle – the Metaslider shortcode is in the “Before Header Content” hook. That hook is a part of the GP Hooks add-on (https://generatepress.com/downloads/generate-hooks/) and is also included in the GP Premium add-on (https://generatepress.com/gp-premium/). The CSS does the styling and positioning. Does that help?
Adding CSS: https://generatepress.com/knowledgebase/adding-css/