.panel {
  width: fit-content;
  box-shadow: 0 0 8px black;
}
.panel-header {
  display: flex;
  align-items: center;
  color: white;
  background-image: linear-gradient(30deg, #f75, #f58);
  padding: .5em 1.5em;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  -ms-user-select: none;
  -moz-user-select: none;
  -webkit-user-select: none;
  user-select: none;
}
.panel-title {
  flex: auto;
  text-shadow: 1px 1px 0 black;
}
.panel-toolbar {
  flex: none;
}
.panel-content {
  padding: 0 1.5em 1.5em 1.5em;
  border-top: 1px solid #bbb;
  background-color: #f6f8fa;
}
.panel-concealment-indicator {
  transition: transform .3s;
  font-family: Georgia, sans-serif;
}