.vmgroup,
.vmproduct {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    /* space between products */
}

.vmproduct>div,
.vmproduct .spacer {
    flex: 0 0 calc(25% - 10px);
    /* 4 per row with gap */
    box-sizing: border-box;
}