[id^="restaler-metabox-"] {
  background: #F8FAFC;
}

#poststuff [id^="restaler-metabox-"].postbox .inside,
#poststuff [id^="restaler-metabox-"].postbox .inside {
  margin: 0;
  padding: 0;
}

[id^="restaler-metabox-"] .postbox-header {
  border-bottom: 1px solid #E2E8F0;
}