.t-product__option-checkmark {
    border-color: #fff !important;
}

.t-product__option-radio:checked + .t-product__option-checkmark,
.t-product__option-checkmark:after {
    background: #fff !important;
    box-shadow: 0 0 0 2px #fff !important;
}

.t-product__option-title {
    color: #fff !important;
}