.panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

.previewArea {
  flex: 0 1 420px;
  min-height: 120px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #111;
  padding: 8px;
  overflow: hidden;
}