How to Add a Modern Reading Progress Bar to Blogger (HTML & CSS)

Custom Scroll Progress Box | FAMOUSCODE.DEV

UI Architecture

Scroll-Sync Progress Container

Enhance your user interface by syncing scroll position with a sticky progress indicator.

Pure CSS Scroll Progress Bar UI inside scrollable box with modern clean design

Interactive Preview

Scroll down to see the magic...

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Source Code (HTML/CSS/JS)

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Scroll Box - FAMOUSCODE</title>
  <style>
    .box-container {
      width: 100%; max-width: 600px; margin: 50px auto;
      border: 1px solid #ddd; border-radius: 12px;
      overflow: hidden; position: relative;
    }
    .progress-wrap {
      position: sticky; top: 0; width: 100%; 
      height: 6px; background: #eee; z-index: 10;
    }
    .progress-bar {
      height: 100%; width: 0%; background: #6366f1;
    }
    .scroll-content {
      height: 300px; overflow-y: scroll; padding: 20px;
    }
  </style>
</head>
<body>

  <div class="box-container">
    <div class="progress-wrap">
      <div id="myBar" class="progress-bar"></div>
    </div>
    <div class="scroll-content" id="myBox">
       <p>Scroll this box...</p>
       <!-- Content Here -->
    </div>
  </div>

  <script>
    const box = document.getElementById("myBox");
    box.onscroll = () => {
      let s = (box.scrollTop / (box.scrollHeight - box.clientHeight)) * 100;
      document.getElementById("myBar").style.width = s + "%";
    }
  </script>

</body>
</html>

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