To style & set design settings for testimonial response,
In the *Testimonial Grid* divi module, goto *Design* tab.
Click on *Response* toggle
*Background* Set the background for the response container
*Margin* - Set margins for response container
*Padding* - Set padding for response container
Set font typography options like
*Response Font*
*Response Font Weight*
*Response Font Style*
*Response Text Alignment*
*Response Text Color*
*Response Text Size*
*Response Letter Spacing*
*Response Line Height*
*Response Text Shadow*
Divi Testimonial Plus: Advanced Testimonial Grid, Slider, Form and SEO Schema - https://wptools.app/wordpress-plugin/...