.hello-world-box {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 20px;
    margin: 20px 0;
    border-radius: 8px;
    text-align: center;
}

.hello-world-box h3 {
    margin-top: 0;
    color: #fff;
}