Hi,

1/ You're using Blockquote - Not paragraph.

You should use paragraph instead of blockquote for your content.

And to change color of blockquote content, please add more this code to Customize > Custom CSS:

\
.post-entry blockquote, .post-entry blockquote p, .wpb_text_column blockquote, .wpb_text_column blockquote p{ color: #313131;  }

Change color code 313131 to any color code you want.

2/ To do that, please add more this code to Customize > Custom CSS:

\
.post-entry h1, .wpb_text_column h1 { font-size: 28px; }\
.post-entry h2, .wpb_text_column h2 { font-size: 24px; }\
.post-entry h3, .wpb_text_column h3 { font-size: 22px; }

Change number 28, 24, 22 to any value you want

Best Regards,

PenciDesign