I apply Magic Action Box plugin in my site. The problem is that when I don’t use Sections, the box keeps contained; however, when I use sections, keeps fluid.
In the appearance, can I see this box contained, but not in the real web, just in the preview.
I’m assuming it’s being added using a shortcode? Looks like they’re not using output buffering, so the shortcode isn’t respecting the HTML on the page.
Try this CSS:
.mab-responsive {
max-width: 980px;
margin: 0 auto !important;
}