ionic-framework/ionic/components/app/structure.scss

html,
body {
  height: 100%;
}

body {
  position: relative;
  overflow: hidden;
  max-width: 100%;
  max-height: 100%;
  margin: 0;
  padding: 0;
}

ion-app {
  display: flex;
  flex-direction: column;

  overflow: hidden;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  margin: 0;
  padding: 0;
}

ion-tabs {
  display: flex;
  flex-direction: column;

  overflow: hidden;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  margin: 0;
  padding: 0;
}

ion-tab {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;

  display: none;
  &.show-tab {
    display: block;
  }
}

ion-nav {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;

  display: flex;
  flex-direction: column;
}

.navbar-container {
  position: relative;
  min-height: 4.4rem;
}

.content-container {
  position: relative;
  flex: 1;
}

ion-navbar {
  position: absolute;
  width: 100%;
  height: 100%;
  min-height: 4.4rem;
  order: $flex-order-toolbar-top;

  display: none;
  &.show-navbar {
    display: flex;
  }

}

ion-toolbar {
  display: flex;
  min-height: 4.4rem;
  background: white;
}

ion-content {
  position: relative;
  display: block;
  flex: 1;
  order: $flex-order-view-content;
}

.scroll-content {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  overflow-y: scroll;
  -webkit-overflow-scrolling: touch;
  will-change: scroll-position;
}

$swipe-handle-width:               20px !default;

swipe-handle {
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  width: $swipe-handle-width;
  height: 100%;
  z-index: $z-index-swipe-handle;
}


// Hardware Acceleration
.transitioning {

  ion-view,
  .ion-view,
  ion-navbar,
  .back-button,
  ion-title {
    will-change: transform, opacity;
  }

}