body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    color: #333;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

.hero {
    background-image: url('https://via.placeholder.com/1500x500/007bff/ffffff?text=Invisalign+Hero+Image'); /* Placeholder image */
    background-size: cover;
    background-position: center;
    color: #fff;
    text-align: center;
    padding: 100px 20px;
}

.hero-content h1 {
    font-size: 3em;
    margin-bottom: 10px;
}

.hero-content p {
    font-size: 1.2em;
    margin-bottom: 30px;
}

.btn {
    display: inline-block;
    background-color: #007bff;
    color: #fff;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-size: 1.1em;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #0056b3;
}

section {
    padding: 60px 0;
    text-align: center;
}

section h2 {
    font-size: 2.5em;
    margin-bottom: 40px;
    color: #007bff;
}

.benefits .benefit-grid {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 20px;
}

.benefits .benefit-item {
    flex-basis: calc(25% - 20px);
    background-color: #f8f9fa;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.benefits .benefit-item h3 {
    color: #007bff;
    margin-bottom: 15px;
}

.testimonials .testimonial-grid {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 20px;
}

.testimonials .testimonial-item {
    flex-basis: calc(33% - 20px);
    background-color: #e9ecef;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    font-style: italic;
}

.testimonials .testimonial-item span {
    display: block;
    margin-top: 15px;
    font-weight: bold;
    color: #007bff;
}

.contact {
    background-color: #007bff;
    color: #fff;
}

.contact p {
    font-size: 1.2em;
    margin-bottom: 20px;
}

.contact .phone-number {
    font-size: 2em;
    font-weight: bold;
}

footer {
    background-color: #333;
    color: #fff;
    padding: 20px 0;
    text-align: center;
    font-size: 0.9em;
}