Hello,
Thanks for the topic.
1. Is this product description? Please describe in more details desired result.
Thanks in advance.
2. Try to use this css code in Theme Options > Styling > Custom css:
.top-bar, .top-bar .textwidget p {
font-size: 14px;
}
if you want to change something else, provide us with your website URL so we can take a closer look.
Regards