body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

header {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 1em 0;
}

header button {
    margin: 1em;
    padding: 0.5em 1em;
    background-color: #fff;
    border: 1px solid #4CAF50;
    border-radius: 5px;
    cursor: pointer;
}

main {
    display: flex;
    padding: 1em;
    padding-bottom: 4em;
}


footer {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 1em 0;
    position: fixed;
    bottom: 0;
    width: 100%;
}

footer a {
    color: white;
}