Hi,

Do you mean you want to custom size for homepage featured boxes on mobile?

If so, please add more this code to Customize > Custom CSS:

@media only screen and (max-width: 480px){
ul.homepage-featured-boxes li .penci-fea-in{ max-width: 250px; margin-left: auto; margin-right: auto; }
}

For change the shape to round, please add more this code to Customize > Custom CSS:

ul.homepage-featured-boxes .penci-fea-in .fea-box-img, ul.homepage-featured-boxes li .penci-fea-in.boxes-style-3:before, ul.homepage-featured-boxes li .penci-fea-in.boxes-style-3:after{ border-radius: 50%; -webkit-border-radius: 50%; }

Best Regards,

PenciDesign