.hero-section {
    background: linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8)), url('your-image.jpg') center/cover no-repeat;
    height: 100vh;
}

.features-section h2 {
    font-weight: bold;
    color: #333;
}

.testimonials-section p {
    font-style: italic;
    font-size: 1.2rem;
}