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

ion-view {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;

  // by default this is display: none;
  // and the transition animation will display it
  display: none;
  flex-direction: column;

  &.show-view {
    display: flex;
  }
}

ion-toolbar {
  display: flex;
  min-height: 4.4rem;
  order: $flex-order-toolbar-top;
}

.stage-off {
  transform: translateX(9999px);
}

ion-toolbar[footer] {
  order: $flex-order-toolbar-bottom;
}

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

.scroll-content {
  // extra div added by ion-content directive to allow for overflow scrolling
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  overflow-y: scroll;
  -webkit-overflow-scrolling: touch;
}