.tcxn-posts [class*=col-md-] {
    margin-bottom: 35px;
}


@media (min-width: 768px) {
    .tcxn-posts [class*=col-md-]:not(.col-md-12) {
        margin-bottom: 0;
    }
    .tcxn-posts [class*=col-md-4]:nth-child(1n + 4) {
        margin-top: 35px;
    }

    .tcxn-posts [class*=col-md-6]:nth-child(1n + 3) {
        margin-top: 35px;
    }
}