body {
    background-color: #f3f4f6;
    display: flex;
    justify-content: center;
}

.mobile-container {
    width: 100%;
    max-width: 480px;
    min-height: 100vh;
    background-color: #ffffff;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
}