.edit-post-layout__metaboxes {
    background:#efefef;
    padding-bottom: 2rem !important;
    padding-top: 2rem !important;
}

.edit-post-layout__metaboxes > * {
    max-width: 950px; 
    margin-left: auto !important;
    margin-right: auto !important;
    width: 100%;
}

.edit-post-layout__metaboxes .postbox {
    background: #fff;
    margin-bottom: 2rem;
}

.acf-repeater .acf-row {
    margin-bottom: 2rem;
}