• Open your Webflow project and head over to the Designer.
• Drag a new Div Block from the Add panel onto your canvas where you want the countdown timer to be.

• Inside the new Div Block, add Text Blocks or Paragraphs to show the days, hours, minutes, and seconds.
• If you want, you can add labels for each time unit (like "Days", "Hours", "Minutes", "Seconds").

• In the Div Block, add an Embed element from the Add panel.
• Click the Edit Custom Code button on the Embed element to open the code editor.

• Inside the code editor, pop in the following HTML structure and JavaScript code:

<div id="countdown">
    <span id="days"></span> Days 
    <span id="hours"></span> Hours 
    <span id="minutes"></span> Minutes 
    <span id="seconds"></span> Seconds
</div>

<script>
  // Set the date we're counting down to
  var countDownDate = new Date("Dec 31, 2023 23:59:59").getTime();

  // Update the count down every 1 second
  var x = setInterval(function() {

    // Get today's date and time
    var now = new Date().getTime();
      
    // Find the distance between now and the count down date
    var distance = countDownDate - now;
      
    // Time calculations for days, hours, minutes and seconds
    var days = Math.floor(distance / (1000 * 60 * 60 * 24));
    var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
    var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
    var seconds = Math.floor((distance % (1000 * 60)) / 1000);
      
    // Output the result in elements with id="days", "hours", "minutes", "seconds"
    document.getElementById("days").innerText = days;
    document.getElementById("hours").innerText = hours;
    document.getElementById("minutes").innerText = minutes;
    document.getElementById("seconds").innerText = seconds;
      
    // If the count down is over, write some text 
    if (distance < 0) {
      clearInterval(x);
      document.getElementById("countdown").innerText = "EXPIRED";
    }
  }, 1000);
</script>

• Change the countdown date in the script to your desired end date and time.

• Use Webflow's Designer to style the Div Block and each of the Text Blocks inside it to match your design needs.
• You can apply custom classes and styles to the countdown timer elements for a better visual fit.

• Once you're happy with the timer setup and styling, publish your Webflow website to see the countdown timer in action.

This step-by-step guide helps you add a functional countdown timer to a Webflow page using a mix of Webflow's visual Designer and custom code.