Perfect vertical+horizontal centering (in SCSS + Bourbon)

gistfile1.scss

  // Perfect vertical+horizontal centering.

  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  @include prefixer(box-align, center, webkit moz ms spec);
  -ms-flex-align: center;
  @include prefixer(align-items, center, webkit spec);
  @include prefixer(box-pack, center, webkit moz);
  -ms-flex-pack: center;
  @include prefixer(justify-content, center, webkit spec);