#cb {
  display: none;
}

#cb~.more_btn::before {
  content: "続きを読む";
}

#cb:checked~.more_btn::before {
  content: "閉じる";
}

.more_wrap {
  display: none;
  border-top: none;
}

#cb:checked~.more_wrap {
  display: flex;
}