.qa { margin-bottom:10px; }
.qa input { display:none; }
.qa label {
  display:block;
  height:30px;
  line-height:30px;
  font-weight:bold;
}

.qa label:before {
  content:"+";
  display:inline-block;
  height:30px;
  width:30px;
  background:#ccc;
  color:White;
  text-align:center;
  margin-right:10px;
}

.qa div {
  display:none;
  padding-top:5px;
}

.qa input:checked ~ label:before {
  content:"-";
  background:#3a4;
}

.qa input:checked ~ div { display:block; }