Open menu button - Pure css

hamburger_cross.scss

.button span {
  position: absolute;
  z-index: 999;
  top: 50%;
  right: 0;
  display: block;
  width: 30px;
  height: 4px;
  margin-top: -2px;
  background-color: #fff;
  font-size: 0px;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-transition: background-color 0.3s;
  transition: background-color 0.3s;
}

.open-menu .button span {
  background-color: transparent;
}

.button span:before,
.button span:after {
  position: absolute;
  left: 0;
  width: 100%;
  height: 100%;
  background: #fff;
  content: '';
  -webkit-transition: -webkit-transform 0.3s;
  transition: transform 0.3s;
}

.button span:before {
  -webkit-transform: translateY(-250%);
  transform: translateY(-250%);
}

.button span:after {
  -webkit-transform: translateY(250%);
  transform: translateY(250%);
}

.open-menu .button span:before {
  -webkit-transform: translateY(0) rotate(45deg);
  transform: translateY(0) rotate(45deg);
}

.open-menu .button span:after {
  -webkit-transform: translateY(0) rotate(-45deg);
  transform: translateY(0) rotate(-45deg);
}