Hello, @Alessandro,
Your provided WP Admin Logins are not working for me, its blocked: https://postimg.cc/5jDQCbY6
I have made the Custom CSS to solve your issue, Please copy and paste the below given CSS code to XStore >> Theme Settings >> Theme Custom CSS >> Global CSS and check back your site after clearing the browser cache.
.page-template-maintenance-php .container.content-page {
max-width: 100% !important;
}
.page-template-maintenance-php .container.content-page .row .content .vc_row.wpb_row.vc_row-fluid.maintenance-row .wpb_column {
width: 80% !important;
margin: auto !important;
}
Regards 8Themes Team.