You might try this:
.site-content, .site-main .widecolumn {
margin-left: 100px;
}
.site-content .entry-header, .site-content .entry-content, .site-content .entry-summary, .site-content .entry-meta, .page-content {
max-width: 596px;
}
You can tweak the two settings to get the alignment you want.
Thank you. Where do I past this?
If it were me, I would put it in the style.css of a child theme so I wouldn’t have to run an extra plugin; however, you say you have the Simple Custom CSS plugin, so you can add it there instead of creating a child theme if you like.
Thank you! Your help is much appreciated.