html, body { margin: 0; height: 100%; background: #121212; }

cast-media-player {
  --theme-hue: 4;
  --progress-color: #e53935;
  --background-color: #121212;
  --font-family: Roboto, 'Helvetica Neue', Arial, sans-serif;
  --spinner-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Ccircle cx='50' cy='50' r='40' fill='none' stroke='%23333' stroke-width='8'/%3E%3Cpath d='M50 10a40 40 0 0 1 40 40' fill='none' stroke='%23e53935' stroke-width='8' stroke-linecap='round'/%3E%3C/svg%3E");
}