body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.container {
    background: white;
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    max-width: 600px;
}

h4 {
    color: #667eea;
    margin-bottom: 30px;
}

#outputBox {
    min-height: 100px;
}