How to customize post snippet?


Hello I am running a blog and want to customize the post snippet. I managed to set the main page posts by using third party json to show posts with different labels but I have to customize them on the label posts where the native script of template render. I didn’t find any css selector by which i can customize the snippet. I have selector for image and heading but not for snippet. Is there any way I can get the selector for snippet. I used .post-snippet but nothing happens. Thanks

you can check the label page here: