mobile trigger effect

/*============= JS ==============*/

$('.custom-menu-primary .hs-menu-wrapper').before('<div class="mobile-trigger"><span></span><span></span><span></span><span></span><span></span><span></span></div>');

/*============= CSS ==============*/

.mobile-trigger {
    display: inline-block !important;
    cursor: pointer;
    position: absolute;
    left: 15px;
    top: 22px;
    z-index: 9999999;
    width: 34px;
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
    -webkit-transition: .5s ease-in-out;
    -moz-transition: .5s ease-in-out;
    -o-transition: .5s ease-in-out;
    transition: .5s ease-in-out;
    height: 24px;
  }
  .mobile-trigger span {
    display: block;
    position: absolute;
    height: 2px;
    width: 50%;
    background: #fff;
    opacity: 1;
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
    -webkit-transition: .3s ease-in-out;
    -moz-transition: .3s ease-in-out;
    -o-transition: .3s ease-in-out;
    transition: .3s ease-in-out;
  }
  .mobile-trigger span:nth-child(odd) {
    left: 0;
  }
  .mobile-trigger span:nth-child(even) {
    left: 50%;
  }
  .mobile-trigger span:nth-child(1), .mobile-trigger span:nth-child(2) {
    top: 0;
  }
  .mobile-trigger span:nth-child(3), .mobile-trigger span:nth-child(4) {
    top: 11px;
  }
  .mobile-trigger span:nth-child(5), .mobile-trigger span:nth-child(6) {
    top: 22px;
  }

  .mobile-open .mobile-trigger span:nth-child(1), .mobile-open .mobile-trigger span:nth-child(6) {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
  }
  .mobile-open .mobile-trigger span:nth-child(2), .mobile-open .mobile-trigger span:nth-child(5) {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
  }

  .mobile-open .mobile-trigger span:nth-child(1) {
    left: 0;
    top: 6px;
  }
  .mobile-open .mobile-trigger span:nth-child(2) {
    left: calc(50% - 5px);
    top: 6px;
  }
  .mobile-open .mobile-trigger span:nth-child(3) {
    left: -50%;
    opacity: 0;
  }
  .mobile-open .mobile-trigger span:nth-child(4) {
    left: 100%;
    opacity: 0;
  }
  .mobile-open .mobile-trigger span:nth-child(5) {
    left: 0;
    top: 18px;
  }
  .mobile-open .mobile-trigger span:nth-child(6) {
    left: calc(50% - 5px);
    top: 18px;
  }