body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #333;
}

header {
    background: #007BFF;
    color: #fff;
    text-align: center;
    padding: 1.5em 0;
}

header .btn {
    background: #fff;
    color: #007BFF;
    padding: 0.5em 1em;
    text-decoration: none;
    border-radius: 5px;
}

section {
    padding: 1.5em;
    text-align: center;
}

footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 1em 0;
}