Vertical alignment with three lines

vertical-alignment.css

.element {
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}

/* Mixin */
@mixin vertical-align {
  position: relative;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}

.element p {
  @include vertical-align;
}

/* Placeholder selector */
%vertical-align {
  position: relative;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}

.element p {
  @extend %vertical-align;
}

.parent-element {
  -webkit-transform-style: preserve-3d;
  -moz-transform-style: preserve-3d;
  transform-style: preserve-3d;
}

.element {
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}