CSS Modal - Interactive Dialog Boxes

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Modal Windows - Example</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    <link rel="stylesheet" href="style.css">
    <script src="script.js" defer></script>
</head>
<body>
<div class="web-page-wrapper">

    <div class="web-modal" id="web-modal1">
        <div class="web-modal-box">
            <button class="web-modal-close" aria-label="Close">&times;</button>
            <div class="web-modal-content">
                <h3>Preview 01</h3>
                <p>You have successfully opened the first modal window. This is a simple single-line content example.</p>
            </div>
        </div>
    </div>
    
    <button class="web-modal-button" data-target="web-modal1" data-toggle="web-modal">MODAL 01</button>
    
    <div class="web-modal" id="web-modal2">
        <div class="web-modal-box">
            <button class="web-modal-close" aria-label="Close">&times;</button>
            <div class="web-modal-content">
                <h3>What is Lorem Ipsum?</h3>
                <p>Lorem Ipsum is dummy text used in typesetting and the printing industry. Lorem Ipsum 
                has been the industry standard dummy text ever since the 1500s, when an unknown printer took a galley 
                of type and scrambled it to make a type specimen book. It has survived not only five centuries, 
                but also the leap into electronic desktop publishing.</p>
                <img src="/icons/smiley-1.svg" alt="smiley">
            </div>
        </div>
    </div>
    
    <button class="web-modal-button" data-target="web-modal2" data-toggle="web-modal">MODAL 02</button>
    
    <div class="web-modal" id="web-modal3">
        <div class="web-modal-box">
            <button class="web-modal-close" aria-label="Close">&times;</button>
            <div class="web-modal-content">
                <h3>Preview 03</h3>
                <p>The third modal window functions completely independently thanks to JavaScript event delegation.</p>
            </div>
        </div>
    </div>
    
    <button class="web-modal-button" data-target="web-modal3" data-toggle="web-modal">MODAL 03</button>
</div>
</body>
</html>

/* Global styles for the sample page */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg, #f8fafc);
    color: var(--fg, #1e293b);
}

.web-page-wrapper {
    padding: 30px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

/* Fullscreen dimmed modal backdrop */
.web-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    /* Temnejše prosojno ozadje, da modal skoči v ospredje */
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

/* Actual white modal window dialog box */
.web-modal-box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--card, #ffffff);
    border: 1px solid var(--border, #e2e8f0);
    border-radius: 12px;
    width: 90%;
    max-width: 600px; /* Limits size on desktop viewpoints to avoid overly stretched lines */
    max-height: 85vh; /* Restricts heights relative to the screen size */
    padding: 30px 20px 20px 20px;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    display: flex;
    flex-direction: column;
}

/* Scrollable container for the content inside the modal box */
.web-modal-content {
    width: 100%;
    overflow-y: auto;
    overscroll-behavior: contain;
    color: var(--fg, #334155);
}

.web-modal-content h3 {
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.web-modal-content p {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 15px;
    opacity: 0.9;
}

.web-modal-content img {
    display: block;
    max-width: 120px;
    height: auto;
    margin-top: 15px;
}

/* Action buttons that open up the modal dialogs */
.web-modal-button {
    background: var(--accent, #007bff);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 12px 24px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: all 0.2s ease;
}

.web-modal-button:hover {
    background: #0056b3;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

/* Close toggle button controller element (X) */
.web-modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--bg, #f1f3f5);
    color: var(--fg, #334155);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    line-height: 1;
    transition: all 0.2s ease;
}

.web-modal-close:hover {
    background: #dc3545;
    color: white;
    transform: rotate(90deg);
}

/* Class appended dynamically via JS to toggle visibility */
.is-open { 
    display: block; 
}

/* Mobile viewpoint response rule definitions */
@media screen and (max-width: 576px) {  
    .web-modal-box {
        width: 95%;
        padding: 25px 15px 15px 15px;
    }
    .web-modal-content img { 
        width: 80px; 
    }  
}

document.addEventListener("mouseup", function (e) {
    const target = e.target;

    // Open targeted modal action condition
    if (target.hasAttribute("data-toggle") && target.getAttribute("data-toggle") === "web-modal") {
        if (target.hasAttribute("data-target")) {
            const targetId = target.getAttribute("data-target");
            const modalElement = document.getElementById(targetId);
            if (modalElement) {
                modalElement.classList.add("is-open");
                document.body.style.overflow = "hidden";
            }
            e.preventDefault();
        }
    }

    // Dismiss active modal when clicking either dark background backdrop overlay or close cross toggle
    if (target.classList.contains("web-modal") || target.closest(".web-modal-close")) {
        const modal = target.closest(".web-modal");
        if (modal) {
            modal.classList.remove("is-open");
            document.body.style.overflow = "auto";
            e.preventDefault();
        }
    }
}, false);

CSS Modal (Dialog Box)