ionic-framework/ionic/components/slides/slides.scss

// Slides
// --------------------------------------------------

$z-index-slider-pager:            1 !default;


.slides {
  display: block;
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
}

.slides-view {
  position: relative;
  height: 100%;
}

.slide {
  position: relative;
  display: block;
  float: left;
  width: 100%;
  height: 100%;
  vertical-align: top;
}

.pager {
  display: block;
  position: absolute;
  bottom: 20px;
  z-index: $z-index-slider-pager;
  width: 100%;
  height: 15px;
  text-align: center;

  .slide-pager-page {
    display: inline-block;
    margin: 0px 3px;
    width: 15px;
    color: #000;
    text-decoration: none;

    opacity: 0.3;

    &.active {
      transition: (opacity 0.4s ease-in);
      opacity: 1;
    }
  }
}