footer {
    height: 500px;
    background-color: #212121;
    color: #FFFFFF;
}
* {
    box-sizing: border-box;
    color: #212121;
}
user agent stylesheet
article, aside, footer, header, hgroup, main, nav, section {
    display: block;
}
html, body {
    padding: 0;
    margin: 0;
    font-family: 'Montserrat', sans-serif;
    font-weight: 400;
    font-size: 20px;
}
* {
    box-sizing: border-box;
    color: #212121;
}
html, body {
    padding: 0;
    margin: 0;
    font-family: 'Montserrat', sans-serif;
    font-weight: 400;
    font-size: 20px;
}
* {
    box-sizing: border-box;
    color: #212121;
}