/* Small devices (portrait tablets and large phones, 600px and up) */
@media only screen and (min-width: 300px) {
  .photobox {
    height: 200px;
    width: 100%;
    background-image: url(img/snow_sm.png);
  }
}

/* Medium devices (landscape tablets, 768px and up) */
@media only screen and (min-width: 768px) {
  .photobox {
    width: 33%;
    background-image: url(img/snow_md.png);
  }
}

/* Large devices (laptops/desktops, 992px and up) */
@media only screen and (min-width: 992px) {
  .photobox {
    width: 50%;
    background-image: url(img/snow_lg.png);
  }

  .custombox{
    width: 100%;
  }
}