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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Custom Modal</title>
    <style>
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            justify-content: center;
            align-items: center;
        }

.modal-content {
            background-color: #fff;
            padding: 20px;
            border-radius: 5px;
            text-align: center;
        }

.close {
            position: absolute;
            top: 10px;
            right: 10px;
            font-size: 20px;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <button id="open-modal">Open Modal</button>
    <div id="modal" class="modal">
        <div class="modal-content">
            <span id="close-modal" class="close">&times;</span>
            <p>This is a custom modal!</p>
        </div>
    </div>
    <script>
        document.getElementById('open-modal').addEventListener('click', function() {
            document.getElementById('modal').style.display = 'flex';
        });

document.getElementById('close-modal').addEventListener('click', function() {
            document.getElementById('modal').style.display = 'none';
        });

window.addEventListener('click', function(event) {
            if (event.target === document.getElementById('modal')) {
                document.getElementById('modal').style.display = 'none';
            }
        });
    </script>
</body>
</html>