.navbar-brand.logo, .navbar-brand.logo img {
    width: 50%;
}

@media (min-width: 992px) {
    .navbar{
        margin-top: 1.5rem!important;
        max-height:50px;
    }
    .navbar-brand.logo{
        width:25%;
    }
    .navbar-brand.logo img {
        position: relative;
        top: 10px;
        width: 50%;
    }
}