.amount {
    display: flex;
    transition: all .3s ease;
    position: relative;
}
.product-page .amount {
    max-width: 23rem;
}
.amount__button {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5px;
    background-color: inherit;
    transition: all .3s ease;
    width: 100%;
    background-color: #fff;
}
.amount__button svg {
    width: 0.6rem;
    height: 1.1rem;
    display: inline-block;
    vertical-align: middle;
    position: relative;
    fill: currentColor;
    fill-rule: evenodd;
}

.amount__button:hover {
    background-color: var(--page-background-color);
}

.product-page .amount__button {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    -ms-flex-pack: center;
    justify-content: center;
    width: 2.4rem;
    position: absolute;
    top: 0.4rem;
    bottom: 0.4rem;
    transition: background 0.25s;
}

.amount__button_left {
    left: 0.4rem;
    border-radius: 4px 0 0 4px;
}
.amount__button_right {
    right: 0.4rem;
    border-radius: 0 4px 4px 0;
}