body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    text-align: center;
}

header {
    background-color: #3498db;
    color: #fff;
    padding: 20px;
}

h1 {
    margin: 0;
}

section {
    padding: 20px;
}

img {
    max-width: 100%;
    height: auto;
    margin-bottom: 20px;
}