header {
    transition: all 500ms cubic-bezier(.99, 0, .1, 1)
}

header.sticky {
    position: fixed;
    width: 100%;
    z-index: 999;
    top: 0
}

@media(max-width:480px) {
    .navbar-brand>img {
        margin: 10px auto 0;
        max-width: 200px
    }
    .navbar-default .social {
        display: none
    }
}