@media only screen and (min-width:1920px) and (max-width:1980px) {

    a.navbar-brand.mainnav {
        margin-left: -19%;
    }

    .fixed-top.buttonheading {
        margin-top: 4.5%;
    }

    img.logo {
        position: fixed;
        width: 9%;
        margin-top: -56px;
        border-radius: 45%;
        margin-left: -11px;
    }
}

@media only screen and (min-width:1600px) and (max-width:1680px) {

    a.navbar-brand.mainnav {
        margin-left: -7.5%;
    }

    .fixed-top.buttonheading {
        margin-top: 5.2%;
    }

    img.logo {
        position: fixed;
        width: 9%;
        margin-top: -56px;
        border-radius: 45%;
        margin-left: -11px;
    }
}

@media only screen and (min-width:1680px) and (max-width:1910px) {

    a.navbar-brand.mainnav {
        margin-left: -10%;
    }

    .fixed-top.buttonheading {
        margin-top: 5%;
    }

    img.logo {
        position: fixed;
        width: 9%;
        margin-top: -56px;
        border-radius: 45%;
        margin-left: -11px;
    }
}