.collapsible              {
    background-color: #7F00FF;
	border: none;
    color: white;
    padding: 18px;
    width: 100%;
    text-align: left;
    font-size: 20px;
}

.active, .collapsible:hover {
    background-color: #FF00FF;
}

.collapsible:after {
    content: '+';
    color: white;
    font-weight: bold;
    float: right;
    margin-left: 5px;
}

.active:after {
  content: "-";
}

.content {
  padding: 0 18px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
}

img.big {
  height: 50%;
  width: 50%;
}