@JacJacC Please follow below steps to update the font size for the description. Let me know whether it is helpful for you.
- From admin go to “Online stores” → “Themes”.
- Click action button from the current theme and select “Edit code”.
- Search for “base.css” file and paste the below code at the bottom of the file.
.product__description * {
font-size: 18px !important;
}
Result will be like,
Please provide your support by click “Like” and “Accepted” if our solution works for you. Thanks for your support.
