Хватит копировать чужие сайты! Создаем уникальный стиль в Тильде с помощью HTML кода.

<!-- Как вставить таймер обратного отсчета в ZeroBlock Tilda tbmsc.ru-->

<script>
document.addEventListener('DOMContentLoaded', () => {

  const SETTINGS = {
    showDays: true,
    showHours: true,
    showMinutes: true,
    showSeconds: true,
    separator: ' • '
  };

  const SOURCE_BLOCK_CLASS = '.uc-timer-block';
  const OUTPUT_SELECTOR = '.zero-timer .tn-atom';

  const getValue = (container, selector) => {
    const el = container.querySelector(selector);
    return el ? el.textContent.trim() : '00';
  };

  const buildTimeString = (data) => {
    const parts = [];

    if (SETTINGS.showDays) parts.push(data.days);
    if (SETTINGS.showHours) parts.push(data.hours);
    if (SETTINGS.showMinutes) parts.push(data.minutes);
    if (SETTINGS.showSeconds) parts.push(data.seconds);

    return parts.join(SETTINGS.separator);
  };

  const updateZeroBlockTimer = () => {
    const source = document.querySelector(SOURCE_BLOCK_CLASS);
    if (!source) return;

    const timeData = {
      days: getValue(source, '.t415__days'),
      hours: getValue(source, '.t415__hours'),
      minutes: getValue(source, '.t415__minutes'),
      seconds: getValue(source, '.t415__seconds')
    };

    const formattedTime = buildTimeString(timeData);
    const targets = document.querySelectorAll(OUTPUT_SELECTOR);

    targets.forEach(node => {
      node.textContent = formattedTime;
    });

    const isFinished = Object.values(timeData).every(v => v === '00' || v === '0');
    if (isFinished) {
      clearInterval(timerInterval);
    }
  };

  updateZeroBlockTimer();
  const timerInterval = setInterval(updateZeroBlockTimer, 1000);

});
</script>

<style>
/* Скрываем стандартный блок таймера Tilda */
[data-record-type="415"] {
  visibility: hidden;
  height: 0;
  overflow: hidden;
}
</style>