.justify {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
html,
body {
  max-width: 640px;
  margin: 0 auto;
  overflow-x: hidden;
}
.ban-wrap {
  width: 16rem;
  margin: 0 auto;
}
.ban-wrap img {
  width: 16rem;
}
.full-img a {
  display: block;
}
.full-img a img {
  display: block;
  width: 100%;
}