Method getCSS

examples/webview_desktop_app.cpp:238–378

    }

    std::string getCSS()
    {
        return R"CSS(
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    margin: 0;
    padding: 20px;
    background: linear-gradient (135deg, #667eea 0%, #764ba2 100%);
    color: #333;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba (0,0,0,0.2);
    overflow: hidden;
}

header {
    background: linear-gradient (135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    margin: 0 0 10px 0;
    font-size: 2.5em;
    font-weight: 300;
}

header p {
    margin: 0;
    opacity: 0.9;
    font-size: 1.1em;
}

.demo-section {
    padding: 30px;
    border-bottom: 1px solid #eee;
}

.demo-section:last-child {
    border-bottom: none;
}

.demo-section h2 {
    margin: 0 0 20px 0;
    color: #2c3e50;
    font-size: 1.4em;
}

button {
    background: linear-gradient (135deg, #667eea 0%, #764ba2 100%);
    color: white;