main .standardContent.blockBoxWrapper {
    align-items: flex-start;
    flex-wrap: wrap;
    
}

main .standardContent .blockBox {
    width: 100%;  
}

@media (min-width: 62em) {
    main .standardContent .blockBox {
        width: 47%;
        min-height: 500px;
        border-right: 1px dotted silver;
    }
}

main .standardContent .blockBox:nth-child(even ) {
    border-right: 0px;
}