.child-accordion {
  h2 {
    display: flex;
    justify-content: space-between;
    cursor: pointer;
  }

  h2::after {
    content: "\276F";
    width: 1em;
    height: 1em;
    text-align: center;
    transform: rotate(90deg);
    transition: all 0.35s;
  }

  h2.open::after {
    transform: rotate(270deg);
  }
}