How to change the font size of post title and meta in widgets

The font size of the post title in widgets is controlled by the customizer which is in proportion to the heading font size defined by Divi.

If you want to use a fixed font size, here is the code snippet you add to your page or Divi theme options. *

/* change the post title font size as desired */
.el-blog-widget .post-title{
	font-size: 14px;
}

/* change the post meta font size as desired */
.el-blog-widget .el-single-post-meta{
	font-size: 12px;
}