.js-product .t-product__option-variants_buttons .t-product__option-item_simple {
    background-color: #877654; !important
    border: 0px;!important
}

.js-product .t-product__option-variants_buttons .t-product__option-item_simple.t-product__option-item_active {
    border: 1px solid #f7f5f1; !important
    background-color: #a09773; !important
}