@mixin transition {
    -o-transition: all 0.3s ease;
    -moz-transition: all 0.3s ease;
    -webkit-transition: all 0.3s ease;
    transition: all 0.3s ease;
  }
  @mixin transformXY {
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
  }
  @mixin transformY {
    top: 50%;
    -webkit-transform: translateY(-50%);
    -moz-transform: translateY(-50%);
    -ms-transform: translateY(-50%);
    -o-transform: translateY(-50%);
    transform: translateY(-50%);
  }
  @mixin transformX {
    left: 50%;
    -webkit-transform: translateX(-50%);
    -moz-transform: translateX(-50%);
    -ms-transform: translateX(-50%);
    -o-transform: translateX(-50%);
    transform: translateX(-50%);
  }
  @mixin position {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: block;
    width: 100%;
  }
  @mixin positionTop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: block;
    width: 100%;
  }
  @mixin positionMiddle {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 0;
    right: 0;
    display: block;
    width: 100%;
  }
  @mixin positionBottom {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    display: block;
    width: 100%;
  }