#region-maps {
  display:   flex;
  flex-wrap: wrap;
}

#region-maps > * { flex: 0 1 auto; }

#region-maps img { width: 100%; }

@media (min-width:  992px) { #region-maps img { max-width: 465px; } }
@media (min-width: 1200px) { #region-maps img { max-width: 550px; } }