.hamburger {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-item-align: center;
      align-self: center;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  width: 27px; margin-top: -3px; opacity: 0.9;
  height: 19px;
  cursor: pointer;
}
.hamburger div {
  -ms-flex-item-align: end;
      align-self: flex-end;
  height: 3px;
  width: 100%;
  background: #FFFFFF;
}
.hamburger .meat {
  width: 100%;
  -webkit-transition: all 200ms ease-in-out;
  transition: all 200ms ease-in-out;
}
.hamburger .bottom-bun {
  width: 100%;
  -webkit-transition: all 400ms ease-in-out;
  transition: all 400ms ease-in-out;
}
.hamburger:hover div {
  width: 100%;
}
.hamburger:hover .top-bun {
  -webkit-animation: burger-hover 1s infinite ease-in-out alternate;
          animation: burger-hover 1s infinite ease-in-out alternate;
}
.hamburger:hover .meat {
  -webkit-animation: burger-hover 1s infinite ease-in-out alternate forwards 200ms;
          animation: burger-hover 1s infinite ease-in-out alternate forwards 200ms;
}
.hamburger:hover .bottom-bun {
  -webkit-animation: burger-hover 1s infinite ease-in-out alternate forwards 400ms;
          animation: burger-hover 1s infinite ease-in-out alternate forwards 400ms;
}

@-webkit-keyframes burger-hover {
  0% {
    width: 100%;
  }
  50% {
    width: 50%;
  }
  100% {
    width: 100%;
  }
}

@keyframes burger-hover {
  0% {
    width: 100%;
  }
  50% {
    width: 50%;
  }
  100% {
    width: 100%;
  }
}