.product-group-select-btn {
    width: 34px !important;
    min-width: 34px;
    height: 34px;
    padding: 0 !important;
    flex: 0 0 34px;
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    text-decoration: none;
}

.product-group-select-btn .button-text {
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    width: auto;
    height: auto;
    margin: 0;
    font-size: 12px;
    line-height: 1;
    opacity: 1;
}