body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}
header {
    background: #35424a;
    color: #ffffff;
    padding: 20px 0;
    text-align: center;
}
main {
    padding: 20px;
}
section {
    margin: 20px 0;
    padding: 20px;
    background: #ffffff;
    border-radius: 8px;
}
.download-button {
    display: inline-block;
    padding: 10px 20px;
    background: #5cb85c;
    color: white;
    text-decoration: none;
    border-radius: 5px;
}
.download-button:hover {
    background: #4cae4c;
}
footer {
    background: #35424a;
    color: #ffffff;
    text-align: center;
    padding: 15px 0;
    position: absolute;
    bottom: 0;
    width: 100%;
}