SideBarMenu.css

#menu {
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  overflow-y: scroll;
  -webkit-overflow-scrolling: touch;
  width: 30%;
  transform: translate(0%, 0);

  &.open-menu {
    transform: translate(100%, 0);
    animation-name: open-menu;
    animation-duration: 0.7s;
  }

  &.close-menu {
    animation-name: close-menu;
    animation-duration: 0.7s;
  }
}

@keyframes open-menu {
  0% {
    transform: translate(100%, 0);
  }
  100% {
    transform: translate(0%, 0);
  }
}

@keyframes close-menu {
  0% {
    transform: translate(0%, 0);
  }
  100% {
    transform: translate(100%, 0);
  }
}

SideBarMenu.scss

#menu {
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  overflow-y: scroll;
  -webkit-overflow-scrolling: touch;
  width: $menu-width;
  @include translateX(0%);

  &.open-menu {
    @include translateX(100%);
    @include experimental(animation-name, open-menu);
    @include experimental(animation-duration, 0.7s);
  }

  &.close-menu {
    @include experimental(animation-name, close-menu);
    @include experimental(animation-duration, 0.7s);
  }
}

@include keyframes(open-menu) {
  0% {
    @include translateX(100%);
  }
  100% {
    @include translateX(0%);
  }
}

@include keyframes(close-menu) {
  0% {
    @include translateX(0%);
  }
  100% {
    @include translateX(100%);
  }
}