.js-product .t-product__option-variants_buttons .t-product__option-item_simple.t-product__option-item_active {
    border: 1px solid rgba(0,0,0,.5);
    background-color: #f5d75d;
}

.js-product .t-product__option-variants_buttons .t-product__option-item_simple {
    margin-bottom: 7px;
    padding: 7px 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 30px;
    min-height: 30px;
    background-color: #ffffff;
    border: 1px solid #ddd;
    border-radius: 15px;
}

.js-product .t-product__option-select {
width: 100%;
border: 1px #111 solid;
background: #f5d75d;
color: #000;
box-sizing: border-box;
cursor: pointer;
padding: 7px 30px 7px 20px;
border-radius: 15px;
-webkit-appearance: none;
-moz-appearance: none;
appearance: none;
}

@media screen and (max-width: 840px)
.t-store .t-product__option-select {
    font-size: 18px;
}