nav {
    text-align: center;
    position: absolute;
    left: 35px;
    z-index: 99;
}
@media only screen and (min-width: 768px) {
    nav {
        top: 30px;
        left: 50px;
    }
}
@media only screen and (min-width: 992px) {
    nav {
        left: 65px;
        top: 40px;
    }
}
@media only screen and (min-width: 1200px) {
    nav {
        left: 85px;
        top: 60px;
    }
}