body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f7f9fb;
}

header {
    background: #2ecc71;
    color: white;
    padding: 15px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    margin: 0;
}

nav a {
    color: white;
    margin: 0 10px;
    text-decoration: none;
    font-weight: bold;
}

.hero {
    background: url('https://images.unsplash.com/photo-1498837167922-ddd27525d352') center/cover;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 40px;
    font-weight: bold;
}

.container {
    padding: 40px;
}

.card {
    background: white;
    padding: 20px;
    margin: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.grid {
    display: flex;
    flex-wrap: wrap;
}

.grid .card {
    flex: 1 1 300px;
}

footer {
    background: #222;
    color: white;
    text-align: center;
    padding: 20px;
}

button {
    background: #2ecc71;
    border: none;
    padding: 10px 20px;
    color: white;
    cursor: pointer;
    border-radius: 5px;
}