.accordion-title{
  text-align:center;
  margin: 0 0 14px 0;
}

.nn-accordion{
  max-width: 520px;
  margin: 0 auto;
}

.nn-acc{
  margin: 0 0 14px 0;
}

.nn-acc__btn{
  list-style: none;
  cursor: pointer;
  padding: 14px 18px;
  background: #6f3fa3;
  color: #fff;
  border-radius: 4px;
  font-weight: 600;
  position: relative;
  box-shadow: 0 2px 0 rgba(0,0,0,0.12);
}

.nn-acc__btn::-webkit-details-marker{display:none;}

.nn-acc__btn::after{
  content:"▼";
  position:absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  opacity: 0.9;
}

.nn-acc[open] .nn-acc__btn::after{content:"▲";}

.nn-acc__panel{
  padding: 12px 16px;
  border: 1px solid #6f3fa3;
  border-top: 0;
  border-radius: 0 0 4px 4px;
  background: #fff;
}