.collapsible {

  background: linear-gradient(180deg, rgb(51, 122, 183,0.65), rgb(51, 122, 183,1) 100%);
  color: white;
  cursor: pointer;
  padding: 10px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 18px;
  font-weight: 300;
  font-family: Verdana, sans-serif;
  transition: color .35s;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.active, .collapsible:hover {
 color:brown;
}

.content {
  padding: 0 18px;
  max-height: 0;
  overflow: hidden;
  transition: opacity 2.0s ease-out,max-height 1.9s ease-out;
  height:auto;
  opacity: 0;
 
}