.flex-b {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: stretch;
}
.flex-b .item {
  width: 27%;
  margin: 0 0 10px 0;
  padding: 10px;
  border-right: 1px solid #000;
  border-bottom: 1px solid #000;
}
@media screen and (max-width: 480px){
.flex-b .item {
  display: none;
  width: 46%;
  margin: 0 1px 1px 0;
  border-right: 1px solid #000;
  border-bottom: 1px solid #000;
}
}

.flex-b dl dd {
  margin: .5em 0;
}