<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Progress Bar</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            background-color: #f0f2f5;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }
        .progress-container {
            width: 100%;
            max-width: 600px;
            background-color: #ddd;
            border-radius: 8px;
            overflow: hidden;
        }
        .progress-bar {
            height: 30px;
            background-color: #007bff;
            width: 0;
            transition: width 0.5s;
            color: white;
            text-align: center;
            line-height: 30px;
        }
        button {
            margin-top: 20px;
            padding: 10px 20px;
            border: none;
            border-radius: 5px;
            background-color: #007bff;
            color: white;
            cursor: pointer;
            font-size: 1em;
        }
        button:hover {
            background-color: #0056b3;
        }
    </style>
</head>
<body>
    <div class="progress-container">
        <div id="progressBar" class="progress-bar">0%</div>
    </div>
    <button onclick="increaseProgress()">Increase Progress</button>

    <script>
        function increaseProgress() {
            var progressBar = document.getElementById('progressBar');
            var width = parseInt(progressBar.style.width) || 0;
            if (width < 100) {
                width += 10;
                progressBar.style.width = width + '%';
                progressBar.textContent = width + '%';
            }
        }
    </script>
</body>
</html>