In Customizer > Layout > Blog –> featured images archives – uncheck Display Padding around Images.
Then go to Customizer > Layout > Container – here you can :
1. Increase – Separating space – the gap between posts.
2. Decrease – Content Separateor – the space between Image > Title > Content
Then add this CSS:
body:not(.single) .post .inside-article {
border: 1px solid #222;
border-radius: 10px;
padding: 0 20px 10px 20px;
}
body:not(.single) .post .post-image img {
width: 100%;
border-radius: 10px 10px 0 0;
}