nav {
    position: absolute;
    top: 0;
    justify-items: center;
    width: 100%;
    -webkit-user-select: none;         
    -moz-user-select: none; 
    -ms-user-select: none; 
    user-select: none; 
}

nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    text-align: center;
}
 
nav ul li {
    display: inline-block;
    margin: 1em;
}
 
a {
    color: inherit;
    text-decoration: none;
}

.pointer {
    cursor: pointer;
}

@media only screen and (max-width: 450px) {
    nav ul li {
        margin: 3vw;
    }
}