.head-link {
    display: block;
    top: 80px !important;
    left: 50% !important;
    margin-left: -240px !important;
}

@media (min-width: 990px)  {
    body {  
        background: #f7f7fb url(../../img/background/bg-medi2018.jpg) no-repeat center 0px fixed;
    }
}

@media (min-width: 660px) and (max-width: 989px) {
    body {  
        background: #f7f7fb url(../../img/background/bg-medi2018-max989.jpg) no-repeat center 0px fixed;
    }
    .head-link {
        display: none;
    }
}

@media (max-width: 659px) {
    body {  
        background:#f7f7fb url(../../img/background/bg-medi2018-max659.jpg) no-repeat center 0px fixed;
    }
}