.accordion {
  margin-bottom: 20px;
}

.accordion__btn {
  position: relative;
  background-color: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  width: 100%;
  min-height: 30px;
  text-align: left;
}

.accordion__btn::after {
  --size: 10px;
  content: '';
  position: absolute;
  z-index: -1;
  width: var(--size);
  height: var(--size);
  border-right: 2px solid var(--color-bg-header);
  border-bottom: 2px solid var(--color-bg-header);
  top: 13px;
  right: 10px;
  transform: translateY(-50%) rotateZ(225deg);
  transition: transform .5s;
}

.accordion__btn.collapsed::after {
  transform: translateY(-50%) rotateZ(45deg);
}

.accordion__content > li:last-child {
  padding-bottom: 10px !important;
}