collapsible.css

/* Style the button that is used to open and close the collapsible content */
.collapsible {
  background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 4px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
}

/* Add a background color to the button if it is clicked on (add the .active class with JS), and when you move the mouse over it (hover) */
.active, .collapsible:hover {
  background-color: #ccc;
}

/* Style the collapsible content. Note: hidden by default */
.content {
  padding: 0 18px;
  display: none;
  overflow: hidden;
  background-color: #ffffff; /* White */
}

div#diagram.content {
  display : block;
  overflow : scroll;
  height: 100%;
  max-height: 1200px;
}

div#repartitionc.content {
  overflow-y : scroll;
  max-height: 100px;
}

div#edit.content {
  overflow-y : scroll;
  max-height: 300px;
}

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

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