.acd-check{
  display: none;
}
.acd-label{
  background: #333;
  color: #fff;
  display: block;
  margin-bottom: 1px;
  padding: 10px;
}
.acd-content{
  border: 1px solid #333;
  height: 0;
  opacity: 0;
  padding: 0 10px;
  transition: .5s;
  visibility: hidden;
}
.acd-check:checked + .acd-label + .acd-content{
  height: 170px;
  opacity: 1;
  padding: 10px;
  visibility: visible;
}