html{
    font-size: 62.5%;
}
.topics_detail{
    font-size: 1.2rem;
}

.price-default {
    text-decoration: line-through;
    color: #888;
    margin-right: 6px;
}

.price-sale {
    color: #d00;
}

.price-normal {
    color: #333;
}

.tax {
    font-size: 12px;
    color: #666;
}