Change text size and color for tags and category meta description on product page

If you want all of the product meta to be styled in the same way, then add the following to your theme custom CSS or style.css in your child theme, and edit as required…

.product_meta {
padding-top: 6px;
border-top: 1px solid #dadada;
color: #666;
font-size: 18px;
}

If you want something different for each of the product meta elements, then you would add something like the following…

.sku_wrapper {
padding-top: 6px;
border-top: 1px solid #dadada;
color: #666;
font-size: 18px;
}

and

.posted_in {
padding-top: 6px;
border-top: 1px solid #dadada;
color: #666;
font-size: 18px;
}