body {

}
.card > img {
  display: block;
}
@media screen and (max-width: 768px) {
  .container {
    padding: 12px;
  }
  .card {
    width: 100%;
    margin-bottom: 20px;
  }
}
@media screen and (min-width: 768px) {
  .container {
    padding: 0 20px;
    margin: 30px auto;
    max-width: 1200px;
  }
  .card {
    float: left;
    width: 44%;
    margin: 30px 3%;
  }
}