style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    list-style-type: none;
    font-family: sans-serif;
    text-decoration: none;
}

header{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 8vh;
    background-color: black;
    color: white;
    padding: 0 1.5rem;
}

nav{
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-toggle{
    display: none;
}

.nav-networks{
    display: flex;
    font-size: 2rem;
}

.nav-networks li{
    margin-right: 1.5rem;
    color: white;
}

.nav-networks li:last-child{
    margin-right: 0;
}

.nav-networks li a{
    color: white;
}

.nav-links{
    width: 250px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-links li a{
    color: white;
}

@media all and (max-width: 991px) {
    
    .nav-toggle, .nav-networks{
        position: relative;
        z-index: 20;
    }
    
    .nav-toggle{
        display: block;
        font-size: 2rem;
        cursor: pointer;
    }

    .nav-toggle .open{
        display: block;
    }

    .nav-toggle .close{
        display: none;
    }

    .opened .nav-toggle .open{
        display: none;
    }

    .opened .nav-toggle .close{
        display: block;
    }

    .nav-links{
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background-color: rgba(0, 0, 0, 0.5);
        flex-direction: column;
        justify-content: space-around;
        padding: 2rem;
        transform: translate(-100%);
        transition: all ease .45s;
    }

    .opened .nav-links{
        transform: translate(0);
    }
}