You really need to upgrade this site to Weaver Xtreme.
Weaver II is way obsolete by now.
Below is the procedure
https://guide.weavertheme.com/converting-a-weaver-ii-pro-or-aspen-site-to-weaver-xtreme/
And for future support, post in the weaver forum
https://forum.weavertheme.com/
As for your question, The content text looks like 16px to me. May be you can post screen shots in the forum
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