body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #111;
    color: white;
}

header {
    background: #333;
    padding: 15px;
    text-align: center;
}

main {
    padding: 20px;
}

.banner {
    background: url("cell.png") center/cover no-repeat;
    height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner h1 {
    background: rgba(0, 0, 0, 0.6);
    padding: 10px 20px;
    border-radius: 5px;
}


section {
    background: #222;
    margin-bottom: 10px;
    padding: 10px;
}

footer {
    background: #000;
    text-align: center;
    padding: 10px;
}