#row3, #row4, #row5, #row6, #row7 {
  display: flex;
  flex-flow: row wrap;
  justify-content: center !important;
}

.cards {
  max-width: 350px !important;
  margin: 10px !important;
  box-shadow: 0 10px 30px rgba(0,0,0,.16);
}

.panel {
  box-shadow: 0 10px 30px rgba(0,0,0,.16);
}