Adjust padding within Post Content module in Divi Builder

I'm using the Divi Builder to create a blog post template, and I would like to adjust the spacing within the post itself. I have written some custom CSS for this, but I'm not sure that it's correct and I can't figure out which module/s to paste it.

The template is currently assigned to this blog post: https://wedfuly.com/wedfulys-ultimate-guide-to-planning-a-beautiful-wedding-in-30-days/

Can someone please help me by checking the code below, and helping me figure out where to put it for this template?

Here is the CSS I have written:

Code:

/*add padding to post title*/
.et_pb_post_title_0_tb_body .et_pb_title_container h1.entry-title, .et_pb_post_title_0_tb_body .et_pb_title_container h2.entry-title, .et_pb_post_title_0_tb_body .et_pb_title_container h3.entry-title, .et_pb_post_title_0_tb_body .et_pb_title_container h4.entry-title, .et_pb_post_title_0_tb_body .et_pb_title_container h5.entry-title, .et_pb_post_title_0_tb_body .et_pb_title_container h6.entry-title
{
padding-bottom: 50px;
}

/*add padding to meta container*/
.et_pb_post_title_0_tb_body .et_pb_title_container .et_pb_title_meta_container, .et_pb_post_title_0_tb_body .et_pb_title_container .et_pb_title_meta_container a

{
padding-bottom: 50px;
}

/*add padding to featured image*/
.et_pb_title_featured_container .et_pb_image_wrap
{
padding-bottom: 50px;

/*add padding above h2*/
.et_pb_post_content_0_tb_body h2
{
padding-top: 50px;
}

/*add padding around h3*/
.et_pb_post_content_0_tb_body h3
{
padding-top: 25px;
padding-bottom: 25px;
}

 

Thanks for your reply! I'm trying to target all posts, but have the template only assigned to that one post for now for testing/while I'm building it out.