<!-- Hidden checkbox to toggle the modal -->
    <input type="checkbox" id="modal-toggle">

    <!-- Button to open the modal -->
    <label for="modal-toggle" style="cursor: pointer;">Open Modal</label>

    <!-- The Modal -->
    <div class="modal">
        <div class="modal-content">
            <a href="#" class="close" onclick="document.getElementById('modal-toggle').click();">&times;</a>
            <h2>Modal Title</h2>
            <p>This is a simple modal dialog without JavaScript!</p>
        </div>
    </div>
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f0f0;
}

/* Hide the checkbox */
#modal-toggle {
    display: none;
}

/* The modal background */
.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;
}

/* Show the modal when the checkbox is checked */
#modal-toggle:checked ~ .modal {
    display: flex;
}

/* The modal content */
.modal-content {
    background-color: white;
    padding: 20px;
    border-radius: 5px;
    max-width: 500px;
    width: 100%;
    text-align: center;
    position: relative;
}

/* The close button */
.close {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 24px;
    text-decoration: none;
    color: #333;
    cursor: pointer;
}

.close:hover {
    color: #ff4c4c;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.