.sticky-parent{
  height: 700vh;
}
.sticky{
  position: sticky;
  top: 0px;
  max-height: 100vh;
  overflow-x: hidden;
  overflow-y: hidden;
}
.dim{
  display: block;
  min-width: 50vw;
  height: 100vh;
}
.horizontal{
  display: flex;
}
.br{
  outline: solid;
}

@media (max-width: 620px) {
  .dim{
    display: block;
    min-width: 100vw;
    height: 100vh;
  }
}

p{
  font-size: 10em;
  text-align: center;
}