body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}
header {
    background: #0077b6;
    color: #fff;
    padding: 10px 20px;
}
header h1 {
    margin: 0;
}
nav a {
    color: #fff;
    margin-right: 10px;
    text-decoration: none;
}
section {
    padding: 20px;
}
footer {
    background: #023e8a;
    color: #fff;
    text-align: center;
    padding: 10px;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
button {
    background: #0077b6;
    color: #fff;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
}
button:hover {
    background: #023e8a;
}