Hi,

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

\
.post-entry blockquote, .post-entry blockquote p, .wpb_text_column blockquote, .wpb_text_column blockquote p{ font-size: 18px; }

Change number 18 to value you want.

2/ Please try add more this code to Customize > Custom CSS to do that:

\
.penci-pullqoute { text-align: center;  }\
.post-entry blockquote, .post-entry blockquote p, .wpb_text_column blockquote, .wpb_text_column blockquote p{ text-align: inherit; }\
.post-entry blockquote, .wpb_text_column blockquote{ display: inline-block; }

Best Regards,

PenciDesign