main {
  display: grid;
  grid-template-columns: 1fr 1fr 2fr;
  grid-template-rows: auto;
}

/*** 500 ***/

@media screen and (max-width: 500px) {
  main {
    display: grid;
    grid-template-columns: auto;
    grid-template-rows: 1fr 1fr 1fr;
  }
}