@media (max-width: 40rem) {
  #txt {
    margin: 2rem 0.5rem 6rem 0.5rem;
  }
}
@media (min-width: 40rem) {
  .txt_div {
    /* position: relative; */
    position:absolute;
    left: 0;
    right: 0;
    transition: all 0.2s ease;
    margin: 2rem 2rem 9rem 7rem;
    background: var(--color-fone-background);
  }
  #txt {
    position: absolute;
    left: 0;
    right: 0;
    margin: 3rem 2rem 3rem 2rem;
  }
  #btn:checked ~ .txt_div {
    margin-left: 18rem;
    /* transition: all 0.3s ease; */
  }
}