/*--------------------------------------------------------------------------*\
    Image in menu item link
\*--------------------------------------------------------------------------*/

.footer__menu-image {
    /*box*/
    width: 20px;

    /*transition*/
    -webkit-transition: -webkit-filter 0.3s;
    transition: filter 0.3s;
}

/*--------------------------------------------------------------------------*\
        Hover (common to all styles)
\*--------------------------------------------------------------------------*/

.footer__menu-link:hover .footer__menu-image{
    /*box*/
    -webkit-filter: grayscale(100%);
    filter: grayscale(100%);
}