This brief video shows you how to insert code into Custom CSS to change the font size for excerpts in Divi, Iconic One and other themes. The codes for accomplishing this are as follows:

Divi:

.et_pb_post p{
font-size: 14px !important;
}

Iconic One and others:

.entry-summary p {
font-size: 14px;
}

Please be sure you back up your site before playing with this. If possible use a child theme!

If this helps and/or you like this video please give me a "Like". Thank you so much!