static/themes/metro-gray/accordion.css

.accordion {
  overflow: hidden;
  border-width: 1px;
  border-style: solid;
}
.accordion .accordion-header {
  border-width: 0 0 1px;
  cursor: pointer;
}
.accordion .accordion-body {
  border-width: 0 0 1px;
}
.accordion-noborder {
  border-width: 0;
}
.accordion-noborder .accordion-header {
  border-width: 0 0 1px;
}
.accordion-noborder .accordion-body {
  border-width: 0 0 1px;
}
.accordion-collapse {
  background: url('images/accordion_arrows.png') no-repeat 0 0;
}
.accordion-expand {
  background: url('images/accordion_arrows.png') no-repeat -16px 0;
}
.accordion {
  background: #fafafa;
  border-color: #abafb8;
}
.accordion .accordion-header {
  background: #c7ccd1;
  filter: none;
}
.accordion .accordion-header-selected {
  background: #84909c;
}
.accordion .accordion-header-selected .panel-title {
  color: #fff;
}