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;
  word-wrap: break-word;

  touch-action: manipulation;
  -webkit-touch-callout: none;
  -webkit-user-drag: none;
  -ms-content-zooming: none;

  -webkit-font-smoothing: antialiased;
  font-smoothing: antialiased;
  text-rendering: optimizeLegibility;

  -webkit-text-size-adjust: none;
  -moz-text-size-adjust: none;
  text-size-adjust: none;

  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

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

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

}

@-webkit-keyframes rotation {
  from {
    -webkit-transform: rotate(0deg);
  }
  to {
    -webkit-transform: rotate(359deg);
  }
}
@keyframes rotation {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(359deg);
  }
}
ion-loading-icon {
  display: flex;
  align-self: center;
  margin: auto;

  font-family: 'Ionicons';
  &:before {
    content: "\f44e";
  }
  font-size: 128px;
  color: #666666;

  animation: rotation 45s infinite linear;
  -webkit-animation: rotation 45s infinite linear;

}

ion-nav {
  height: 100%;
}

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

  display: flex;
  flex-direction: column;
}

.nav-item {
  display: none;

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

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

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

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