.footer
{
    height:200px;
    text-align:center;
}
a.icons
{
    width:50px;
    padding:20px;
    filter:grayscale(100);
    text-decoration:none !important;
    border: 0px;
}
a.icons:hover
{
    text-decoration:none !important;
    filter:brightness(1);
    border: 0px;
}