.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: 40px;
    height: 24px;
    display: inline-block;
    position: relative; }
  
  .hamburger-inner {
    display: block;
    top: 50%;
    margin-top: -2px; }
    .hamburger-inner, .hamburger-inner::before, .hamburger-inner::after {
      width: 40px;
      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; }
  
  /*
     * Collapse
     */
     .hamburger--elastic .hamburger-inner {
        top: 2px;
        transition-duration: 0.275s;
        transition-timing-function: cubic-bezier(0.68, -0.55, 0.265, 1.55); }
        .hamburger--elastic .hamburger-inner::before {
          top: 10px;
          transition: opacity 0.125s 0.275s ease; }
        .hamburger--elastic .hamburger-inner::after {
          top: 20px;
          transition: transform 0.275s cubic-bezier(0.68, -0.55, 0.265, 1.55); }
      
      .hamburger--elastic.is-active .hamburger-inner {
        transform: translate3d(0, 10px, 0) rotate(135deg);
        transition-delay: 0.075s; }
        .hamburger--elastic.is-active .hamburger-inner::before {
          transition-delay: 0s;
          opacity: 0; }
        .hamburger--elastic.is-active .hamburger-inner::after {
          transform: translate3d(0, -20px, 0) rotate(-270deg);
          transition-delay: 0.075s; }