To put it simply, the website generates sample images for PC, tablets, and mobile devices. Here is an example:

If you don't know how to use Photoshop, it can be quite troublesome to create such an image. However, Xiaoz found an online service that can generate this kind of image by simply inputting the URL, which is much more convenient.

Generation URL: https://slt.zhaoshuai.me/

Furthermore, this tool is open-source. If the above URL becomes inaccessible one day, you can also set it up on your own (requires PHP environment).

Project URL: https://github.com/inger0/slt.zhaoshuai.me