Theorem style in slides

Dear friend,

I observed that someone was able to customize the lemma environment in the following beautiful way:22
But when I build my slides, I can merely get the following plain style:

Could you kindly advise on how I might achieve a more aesthetically pleasing version?

Thank you very much.

Best Regards,

When your cursor is within the theorem environment, simply activate Framed theorems from the dropdown menu, accessible via the icon resembling a small wrench on the focus toolbar, as shown in the following screenshot. In this case, you’ll find an extended Style parameters section where you can experiment to create your own customized version that suits your preferences.

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