.menu-toggle {
  width: 28px;
  height: 22px;
  position: relative;
  cursor: pointer;
  z-index: 1001;
  background: none;
  border: none;
}

.menu-toggle span {
  position: absolute;
  width: 100%;
  height: 2px;
  background: white;
  left: 0;
  transition: 0.3s ease;
}

.menu-toggle span:nth-child(1) { top: 0; }
.menu-toggle span:nth-child(2) { top: 10px; }
.menu-toggle span:nth-child(3) { bottom: 0; }

.menu-toggle.open span:nth-child(1) {
  transform: rotate(45deg);
  top: 10px;
}

.menu-toggle.open span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.open span:nth-child(3) {
  transform: rotate(-45deg);
  bottom: 10px;
}