Hi,

You can add more this code to Customize > Custom CSS to do that:

.post-entry h1, 
.post-entry h2, 
.post-entry h3, 
.post-entry h4, 
.post-entry h5, 
.post-entry h6, 
.post-entry hr, 
.wpb_text_column h1, 
.wpb_text_column h2, 
.wpb_text_column h3, 
.wpb_text_column h4, 
.wpb_text_column h5, 
.wpb_text_column h6, 
.wpb_text_column hr{
    margin-bottom: 30px;
}
.widget ul li, .post-entry, p, .post-entry p{ line-height: 2.0; }

Change values 30 and 2.0 to values as you want.

Example:  40 or 1.9

Best Regards,

PenciDesign