<section class="FAQ">
      <div class="container">
        <div class="faq__container">
          <div class="faq__elems">
            <div class="faq__elem">
              <div class="elem-top">
                <p>Доставка и возврат</p>
                <img src="images/faq.svg" alt="" class="faq__arrow">
              </div>
              <div class="elem-bot">
                Lorem ipsum dolor sit amet consectetur, adipisicing elit. Tempore a, minus ipsum aliquid ex eligendi. Voluptatem totam eos adipisci nam numquam corrupti ea porro reprehenderit incidunt, unde ad deleniti ratione.
              </div>
            </div>
            <div class="faq__elem">
              <div class="elem-top">
                <p>Обслуживание</p>
                <img src="images/faq.svg" alt="" class="faq__arrow">
              </div>
              <div class="elem-bot">
                Lorem ipsum dolor sit amet consectetur, adipisicing elit. Tempore a, minus ipsum aliquid ex eligendi. Voluptatem totam eos adipisci nam numquam corrupti ea porro reprehenderit incidunt, unde ad deleniti ratione.
              </div>
            </div>
            <div class="faq__elem">
              <div class="elem-top">
                <p>Подарочная служба</p>
                <img src="images/faq.svg" alt="" class="faq__arrow">
              </div>
              <div class="elem-bot">
                Lorem ipsum dolor sit amet consectetur, adipisicing elit. Tempore a, minus ipsum aliquid ex eligendi. Voluptatem totam eos adipisci nam numquam corrupti ea porro reprehenderit incidunt, unde ad deleniti ratione.
              </div>
            </div>
            <div class="faq__elem">
              <div class="elem-top">
                <p>Таблица размеров</p>
                <img src="images/faq.svg" alt="" class="faq__arrow">
              </div>
              <div class="elem-bot">
                Lorem ipsum dolor sit amet consectetur, adipisicing elit. Tempore a, minus ipsum aliquid ex eligendi. Voluptatem totam eos adipisci nam numquam corrupti ea porro reprehenderit incidunt, unde ad deleniti ratione.
              </div>
            </div>
          </div>
        </div>
      </div>
    </section>

.faq__container {
  padding: 100px 150px;
}

.elem-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  padding: 30px 0;
  border-bottom: 1px solid #D8D8D8;
}

.faq__elem:first-child{
  border-top: 1px solid #D8D8D8;
}

.elem-top p{
  font-family: Montserrat;
  font-size: 20px;
  font-style: normal;
  font-weight: 400;
  line-height: 24px;
  letter-spacing: 0em;
}

.elem-bot {
  display: none;
}
.active_text{
  display: block;
}
.arrow_rotate {
  transform: rotate(90deg);
  transition: .5s;
}

document.addEventListener("DOMContentLoaded", () => { 
  const accord = document.querySelectorAll('.elem-top');
  const accord_text = document.querySelectorAll('.elem-bot');
  const arrow = document.querySelectorAll('.faq__arrow');

  for(let i = 0; i < accord.length; i++) {
    accord[i].addEventListener('click', textdown);
  }

  function textdown() {
    for(let i = 0; i <= accord_text.length; i++) {
      accord_text[i].classList.toggle('active_text');
      arrow[i].classList.toggle('arrow_rotate');
    }
  };
 });