/*==============================General Menu style============================*/

/*==============================General Menu style============================*/
  /* Responsive Navigation Basic Style
  ===============================================================================================*/
#menu {
  display: none;
}
@media screen and (max-width: 768px) {
  #menu {
    display: block;
    background: #dddddd;
    font-size: 1.35em;
    text-align: right;
    cursor: pointer;
    padding: 5px;

    & span {
      margin-right: 10px;
    }
  }

  #nav {
    display: none;

    & ul {
      margin: 0 auto;
      padding: 2%;
      background-color: #dddddd;
    }

    & li {
      width: 100%;
      display: block;
    }
  }
}
Include Rb- css for responsive menu
Include Rb- css for responsive menu

Also include on MEDIA less file
