.radio-fab {
  position: fixed;
  top: 200px ;
  left: 20px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #2196f3;
  color: #fff;
  display: none; /* shown only when radio connected */
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10010;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  user-select: none;
  touch-action: none;
}
.radio-fab.show {
  display: flex;
}
.radio-fab.disconnected {
  background: #f44336; /* Material red 500 */
}
.radio-fab i {
  pointer-events: none;
  font-size: 28px;
}
.radio-fab-panel {
  position: fixed;
  left: -9999px; /* will be positioned via JS */
  top: -9999px;
  width: 280px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  transform: scale(0);
  transform-origin: bottom right;
  transition: transform 0.2s ease-out;
  padding: 12px;
  z-index: 10011;
}
.radio-fab-panel.open {
  transform: scale(1);
}
.radio-fab-panel h6 {
  margin: 0 0 6px 0;
}
.radio-fab-panel .row {
  margin-bottom: 8px;
}