Note: We have card with all CSS centering options. You probably want to head over there and get an overview over what techniques are available for your use case and browser requirements.

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Horizontally centering a static element in CSS is normally handled by setting the left and right margins to auto, for example:

// SASS
$container_width: 100px
.container
  width: $container_width
  margin: 0 auto

However, this won’t work on an absolutely positioned element. But there is a solution:

// SASS
$container_width: 100px
.container
  width: $container_width
  position: absolute
  left: 50%
  margin-left: floor($container_width / 2) * -1