Align Center in Shortcode Broken: [BUG] Adds "align_center" CSS but no matching CSS

[presswizards]

#23

What is the desired behavior?

Using shortcode:
[wp-pic type="plugin" slug="pretty-simple-popup-builder" layout="large" scheme="scheme2" align="center" ajax="yes" ]

It should center the large layout.

What is the actual behavior?

It does not center, the CSS I see is:
class="wp-pic-wrapper align_center large"

align_center is not in the plugin's CSS. I do see .wp-pic-wrapper.aligncenter.large and .wp-pic-wrapper.alignfull.large etc in the CSS, but it's not applied via the shortcode it seems.

Steps to reproduce undesired behavior:

Try using the shortcode with align="center".

Screenshots or Video

I've added custom CSS to resolve the issue:

.wp-pic-wrapper.align_center {
text-align: center;
}

You can see my live page here, centered because of the above CSS, uncheck that CSS to view it not centered:
https://5starplugins.com/pretty-simple-popup-builder/

Additional Comments

Hope you can fix it, I'm sure it's affecting other sites.