@media (max-width:768px) {
    header {
        display:flex;
        justify-content:space-between;
        background-color:#000;
        padding:10px 10px;
        position:fixed;
        width:100%;
        top:0;
        z-index:10
    }
    .logo {
        height:30px
    }
    .menu-btn {
        display:none
    }
}