body {
  margin: 50px;
}


a:hover, a:visited, a:link, a:active {
  text-decoration: none;
}


.controls {
  margin-bottom: 10px;
}


.collapse-group {
  padding: 10px;
  border: 1px solid darkgrey;
  margin-bottom: 10px;
}
.panel-title .trigger:before {
  content: '\e082';
  font-family: 'Glyphicons Halflings';
  vertical-align: text-bottom;
}


.panel-title .trigger.collapsed:before {
  content: '\e081';
}