RadzenTabs show as bulleted list

When I try to create a tabbed control, the tabs show as a bulleted list instead of tabs.
How can I get these to display as tabs?

<Radzen.Blazor.RadzenTabs>
    <Tabs>
        <Radzen.Blazor.RadzenTabsItem Text="aaaaaa">
            xxx
        </Radzen.Blazor.RadzenTabsItem>
        <Radzen.Blazor.RadzenTabsItem Text="bbbb">
            zzzzzzz
        </Radzen.Blazor.RadzenTabsItem>
    </Tabs>
</Radzen.Blazor.RadzenTabs>

using Radzen 4.24.2, .Net 7.0

You’ve missed to register the required CSS most probably, check our Getting Started page for reference.