body {
  margin: 0;
  background: color-mix(in srgb, olive 100%, salmon 10%);
}
main {
  display: flex;
  position: relative;
  flex-direction: row;
  height: 100vh;
  overflow: hidden;
  overflow-x: auto;
  gap: 1em;
  overflow-y: scroll;
}
div {
  font-size: 12vw;
  padding: .5em;
  color: salmon;
  background: olive;
  flex-shrink: 0;
  width: calc(var(--w, 70) * 1vw);
}