.wrap {
  background: #3a3a3a;
  padding: 20px 20px 50px;
}
.wrap p,.wrap h3,.wrap h4, .wrap dt {
  color: #c7c7c7;
}
.box-demo {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
  max-width: 300px;
  margin: auto;
}
.box-demo * {
  display: block;
  width: 100%;
}