Hide Navigation only on mobile

Site URL: https://luyangzou.com/

Hi, 

I use CSS to move my main navigation at the centre of my page.

#navigator header#topBar ul#nav {
    display: block;
    float: none;
    text-align: center;
      padding: 10px 0 20px 0;
      margin: 0 0 0 75px;
    max-width: 100%;
}

but I want to hide my Navigation only on mobile device.

How can I do that?

Thanks.

@media screen and (max-width: 480px) {
  #topBar {
  	display: none;
  }
  #container {
    margin-top: 0 !important;
  }
}

Try this