How to get 'colorlib' red square as on theme preview

Hello everyone.

I’m starting with Sparkling and I’ve an easy question for you after searching without success.
How do I get the red square ‘colorlib’ that we can see in the theme preview?

Thanks in advance for your help

Hi @superkoala,

I hope you are well today and thank you for your question.

That is just a featured image containing colorlib text https://colorlib.com/sparkling/wp-content/uploads/sites/5/2014/03/colorlib-logo-slider-750x410.jpg

You can set the featured image for the post so that it will display like that on posts listings page.

Best Regards,
Movin