Pin a footer to the bottom of the viewport in desktop browsers with this custom CSS for your WordPress site.
.site-footer {
background-color: #1c1c1c;
line-height: 35px;
padding: 15px 0;
bottom: 0;
position: fixed;
width: 100%;
display: block;
z-index: 99999;
}
.site-footer,
.site-footer a {
color: #666;
}