How to add border radius on image and content box in box-extended layout

To add border radius on image and content box you need to add a code snippet.

Go to WordPress Dashboard >> Divi >> Theme Options >> Custom CSS >> add below CSS code.

.box_extended .post-content, .box_extended .post-media 
{
  border-radius: 5px;
}

Here you can change the 5px size according to your need.

Output: