.ads-row,
.ads-column {
  position: fixed;
  display: flex;
  z-index: 9999;
}

.ads-row iframe,
.ads-column iframe {
  width: 160px;   /* 2/3 of ~240px */
  height: 80px;   /* 2/3 of ~120px */
  border: none;
  margin: 2px;
}

/* Positioning */
.ads-row.top {
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  flex-direction: row;
}

.ads-row.bottom {
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  flex-direction: row;
}

.ads-column.left {
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  flex-direction: column;
}

.ads-column.right {
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  flex-direction: column;
}