The Pullquote Block allows you to highlight certain text. Pull quotes are short excerpts from your content. They're used to pull a text passage out of the content so as to highlight and provide a visual aid to your readers.
Once you've added your content to your block, you can select from one of two different styles using the Styles panel in the Settings Sidebar or by clicking on the Change block type icon on the Block Toolbar. If you select a style in the Default Style dropdown list, any further Quote Blocks you add into your page will use that selected style by default. You can also change the main colour and text colour.