#panel {
  text-align: left;
  width: 100%;
}
 
#panel > dt {
  border-bottom: solid 1px white;
  background-color: #ccc;
  color: white;
  cursor: pointer;
  padding: 10px;
  font-weight: bold;
}
#panel > dt:hover {
  background-color: #999;
}
#panel > dt::before  {font-family: FontAwesome; font-size: 2.4rem; vertical-align: middle; content: "\f059"; margin: 0 0.3em 0 0;}

#panel > dd {
  border: solid 1px Silver;
  margin: 0px;
  padding: 10px;
}