@charset "utf-8";
@import "normalize";

body {
  background: #AA0000;
  text-align: center;
  font-family: "Lato", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 1em;
}

.container {
  position: absolute;
  top: 5%;
  width: 100%;
  text-align: center;
  border: 1px solid gray;
}

.card {
  width: 320px;
  height: 568px;
  border: 1px solid white;
  display: inline-block;
  margin: 0 35px;
}

@charset "utf-8";
@import "normalize";

$card-width: 320px;
$card-height: 568px;

body {
  background: #AA0000;
  text-align: center;
  font-family: "Lato", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 1em;
}

.container {
  position: absolute;
  top: 5%;
  width: 100%;
  text-align: center;
  border: 1px solid gray;
}

.card {
  width: $card-width;
  height: $card-height;
  border: 1px solid white;
  display: inline-block;
  margin: 0 35px 20px 35px;
  @media only screen and (max-width: $card-width * 2) {
    margin: 0 0 20px 0;
  }
}

Update card margin on mobile screen sizes
Update card margin on mobile screen sizes
