@media only screen and (max-width: 600px) {
  .top-bar-link {
    display: none;
  }
}

@media only screen and (max-width: 330px) {
  #signin {
    display: none;
  }
}

@media only screen and (max-width: 240px) {
  #top-bar-register {
    display: none;
  }
}