.ratio-box-default {
  overflow: hidden;
  position: relative;
}
.ratio-box-default:before {
  content: "";
  display: block;
  height: 0;
  padding-top: 100%;
}
.ratio-box-1x1 {
  overflow: hidden;
  position: relative;
}
.ratio-box-1x1:before {
  content: "";
  display: block;
  height: 0;
  padding-top: 100%;
}
.ratio-box-2x1 {
  overflow: hidden;
  position: relative;
}
.ratio-box-2x1:before {
  content: "";
  display: block;
  height: 0;
  padding-top: 50%;
}
.ratio-box-1x2 {
  overflow: hidden;
  position: relative;
}
.ratio-box-1x2:before {
  content: "";
  display: block;
  height: 0;
  padding-top: 200%;
}