body {
    margin: 0;
    padding: 0;
    background-image: url('background.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    font-family: Arial, sans-serif;
}

.app-container {
    background: rgba(255, 255, 255, 0.78);
    backdrop-filter: blur(6px);
    max-width: 900px;
    margin: 40px auto;
    padding: 25px 35px;
    border-radius: 18px;
    box-shadow: 0 4px 18px rgba(0,0,0,0.2);
}

h1 {
    margin-top: 0;
    color: #333;
}