@media only screen and (max-width: 767px) {
    .logo .logo-link img {
    display: none;
    }
.logo .logo-link {
    background-image: url('https://sladedesign.co.uk/docs/alice-timms-logo-mobile.png');
    background-size: 150px, cover;
    background-repeat: no-repeat;
    }
}