ionic-framework/playground/layouts/view.css

body {
  text-align: center;
}

.tool-bar {
  min-height: 50px;
  background: linear-gradient(45deg, #4c4c4c 0%,#595959 12%,#666666 25%,#474747 39%,#2c2c2c 50%,#000000 51%,#111111 60%,#2b2b2b 76%,#1c1c1c 91%,#131313 100%);
  color: white;
}

.nav-bar {
  display: -webkit-box;
  display: -webkit-flex;
  display: -moz-box;
  display: -moz-flex;
  display: -ms-flexbox;
  display: flex;

  -webkit-justify-content: center;
  -webkit-align-items: center;
}

.nav-bar > .nav-item {
  -webkit-flex: 1;
  max-width: 120px;
}

.view > .container > .content {
  background: linear-gradient(135deg, #f2f6f8 0%,#d8e1e7 50%,#b5c6d0 51%,#e0eff9 100%);
}

f {
  display: block;
  margin: 20px auto;
  width: 200px;
  height: 300px;
  background: blue;
}