Remove order

You have jetpack installed ?

No, I have not installed jetpack. I am able to do changes in the style.css or x.php via wordpress editor or notepad++, but I am not experienced in html and therefore I need some help ..

Ok, there’s two ways to add custom css to your website.

1. Child theme
If you familiar with child theme, please create it or you can download it here.
Please add the below code to the child them style.css

.home .hentry { box-shadow: none; }

2. Custom css plugin
If you are not confident with child theme, you can install https://www.ads-software.com/plugins/simple-custom-css/ add the same code to the custom css box.

Thank you very much,
child theme plus html worked perfectly