.hamburger {
    padding: 15px 15px;
    display: inline-block;
    cursor: pointer;
    transition-property: opacity, filter;
    transition-duration: 0.15s;
    transition-timing-function: linear;
    font: inherit;
    color: inherit;
    text-transform: none;
    background-color: transparent;
    border: 0;
    margin: 0;
    overflow: visible; }
    .hamburger:hover {
      opacity: 0.7; }
    .hamburger.is-active:hover {
      opacity: 0.7; }
    .hamburger.is-active .hamburger-inner,
    .hamburger.is-active .hamburger-inner::before,
    .hamburger.is-active .hamburger-inner::after {
      background-color: #000; }

  .hamburger-box {
    width: 30px;
    height: 24px;
    display: inline-block;
    position: relative;
    transform:scale(0.7);
}

  .hamburger-inner {
    display: block;
    top: 50%;
    margin-top: -2px;
}
    .hamburger-inner, .hamburger-inner::before, .hamburger-inner::after {
      width: 30px;
      height: 4px;
      background-color: #000;
      border-radius: 4px;
      position: absolute;
      transition-property: transform;
      transition-duration: 0.15s;
      transition-timing-function: ease;
  }
    .hamburger-inner::before, .hamburger-inner::after {
      content: "";
      display: block; }
    .hamburger-inner::before {
      top: -10px; }
    .hamburger-inner::after {
      bottom: -10px; }
/*
   * Vortex
   */
   .hamburger--vortex .hamburger-inner {
    transition-duration: 0.2s;
    transition-timing-function: cubic-bezier(0.19, 1, 0.22, 1); }
    .hamburger--vortex .hamburger-inner::before, .hamburger--vortex .hamburger-inner::after {
      transition-duration: 0s;
      transition-delay: 0.1s;
      transition-timing-function: linear; }
    .hamburger--vortex .hamburger-inner::before {
      transition-property: top, opacity; }
    .hamburger--vortex .hamburger-inner::after {
      transition-property: bottom, transform; }

  .hamburger--vortex.is-active .hamburger-inner {
    transform: rotate(765deg);
    transition-timing-function: cubic-bezier(0.19, 1, 0.22, 1); }
    .hamburger--vortex.is-active .hamburger-inner::before, .hamburger--vortex.is-active .hamburger-inner::after {
      transition-delay: 0s; }
    .hamburger--vortex.is-active .hamburger-inner::before {
      top: 0;
      opacity: 0; }
    .hamburger--vortex.is-active .hamburger-inner::after {
      bottom: 0;
      transform: rotate(90deg); }

  /*