.hiddenblock {
  background-color: #99b398;
  color: white;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
}

.visibleblock{
  background-color: #c1dac1;
}

.blockcontent {
  padding: 0 18px;
  display: none;
  overflow: hidden;
  background-color: #e6ede3;
}

.hiddenblock:after {
  color: white;
  content: '\02795'; /* Unicode character for "plus" sign (+) */
  font-size: 13px;
  float: right;
  margin-left: 5px;
}

.visibleblock:after {
  content: "\2796"; /* Unicode character for "minus" sign (-) */
}