.nav-icon{
    width: 30px;
    height: 30px;
    position: relative;
    transition: .1s;
    margin: 10px 10px;
    cursor: pointer;
    display: inline-block;
}
.nav-icon span{
    width: 5px;
    height: 5px;
    background-color: #000000;
    display: block;
    border-radius: 50%;
    position: absolute;

}
.nav-icon:hover span{
    transform: scale(1.2);
    transition: 350ms cubic-bezier(.8, .5, .2, 1.4);
}
.nav-icon span:nth-child(1){
    left: 0;
    top: 0;
}
.nav-icon span:nth-child(2){
    left: 12px;
    top: 0;
}
.nav-icon span:nth-child(3){
    right: 0;
    top: 0;
}
.nav-icon span:nth-child(4){
    left: 0;
    top: 12px;
}
.nav-icon span:nth-child(5){
    position: absolute;
    left: 12px;
    top: 12px;
}
.nav-icon span:nth-child(6){
    right: 0px;
    top: 12px;
}
.nav-icon span:nth-child(7){
    left: 0px;
    bottom: 0px;
}
.nav-icon span:nth-child(8){
    position: absolute;
    left: 12px;
    bottom: 0px;
}
.nav-icon span:nth-child(9){
    right: 0px;
    bottom: 0px;
}
.nav-icon.open{
    transform: rotate(180deg);
    cursor: pointer;
    transition: .2s cubic-bezier(.8, .5, .2, 1.4);
}
.nav-icon.open span{
    border-radius: 50%;
    transition-delay: 200ms;
    transition: .5s cubic-bezier(.8, .5, .2, 1.4);
}
.nav-icon.open span:nth-child(2) {
    left: 6px;
    top: 6px;
}
.nav-icon.open span:nth-child(4) {
    left: 6px;
    top: 18px;
}
.nav-icon.open span:nth-child(6) {
    right: 6px;
    top: 6px;
}
.nav-icon.open span:nth-child(8) {
    left: 18px;
    bottom: 6px;
}