Each post in its own frame…

thought i found it but it wasn’t the correct code :/

here is another demo of the style i want
https://roundeddemo.wordpress.com/

The first example is just the addition of the HTML tag <hr /> to the index.php file (probably in front of the the_title function).

The other examples would require more extensive editing.
If you are uncomfortable with editing your theme files, you can probably find asssistance on sites like wpquestions.com or jobs.wordpress.net

i think you can do it with CSS. Just use the border-radius property.You can find some additional info on this site:

https://www.css3.info/preview/rounded-border/