countdown-timer {
  display: block;
  line-height: 1;
  margin: 1em 0;
}

countdown-timer table {
  background: #000;
  border: 3px outset #ff00ff;
  border-collapse: separate;
  border-spacing: 0;
  text-align: center;
}

countdown-timer th, countdown-timer td {
  padding: 10px;
  border: 2px inset #ff00ff;
}

countdown-timer tbody {
  font-size: 3em;
  font-weight: bold;
  font-family: Impact, 'Arial Black', sans-serif;
}

countdown-timer tfoot {
  font-weight: bold;
  background: #333;
}

countdown-timer [data-unit="days"] { color: #00ff00; }
countdown-timer [data-unit="hours"] { color: #ffff00; }
countdown-timer [data-unit="mins"] { color: #00ffff; }
countdown-timer [data-unit="secs"] { color: #ff00ff; }

countdown-timer .message {
  font-size: 2em;
  font-weight: bold;
  font-family: Impact, 'Arial Black', sans-serif;
  color: #ff00ff;
}

@media (max-width: 768px) {
  countdown-timer th, countdown-timer td {
    padding: 5px;
  }

  countdown-timer .message {
    font-size: 1.2em;
  }
}