tres.css

* {
  margin: 0;
  padding: 0;
  outline: 0;
  border: 0;
  -webkit-box-sizing: border-box;
  box-sizing: border-box; }

html {
  min-height: 510px;
  min-width: 100%;
  font-size: 62.5%; }

html, body {
  overflow: hidden;
  width: 100%;
  height: 100%; }

body {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  line-height: 2.3rem;
  -webkit-perspective: 800;
  -webkit-text-size-adjust: none;
  -webkit-transform-style: preserve-3d;
  -webkit-user-select: none; }

.screen {
  -webkit-transition: all 0.25s ease-out;
  -moz-transition: all 0.25s ease-out;
  -ms-transition: all 0.25s ease-out;
  transition: all 0.25s ease-out;
  -webkit-transform: translate3d(100%, 0%, 0);
  -moz-transform: translate3d(100%, 0%, 0);
  -ms-transform: translate3d(100%, 0%, 0);
  transform: translate3d(100%, 0%, 0);
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  opacity: 0;
  overflow-y: auto;
  pointer-events: none; }
  .screen.current-screen {
    -webkit-transform: translate3d(0%, 0%, 0);
    -moz-transform: translate3d(0%, 0%, 0);
    -ms-transform: translate3d(0%, 0%, 0);
    transform: translate3d(0%, 0%, 0);
    opacity: 1;
    pointer-events: auto; }
  .screen.modal-screen {
    z-index: 1000; }

.screen-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  margin: 0;
  line-height: 40px;
  text-align: center;
  overflow: hidden;
  z-index: 100; }
  .screen .screen-header + .content {
    top: 50px; }
  .screen-header > a, .screen-header > button {
    -webkit-transform: translate3d(0, -50%, 0);
    -moz-transform: translate3d(0, -50%, 0);
    -ms-transform: translate3d(0, -50%, 0);
    transform: translate3d(0, -50%, 0);
    position: absolute;
    top: 50%;
    min-width: 2.9rem;
    font-size: 2.1rem;
    text-decoration: none; }
    .screen-header > a.left, .screen-header > button.left {
      left: 1rem; }
    .screen-header > a.right, .screen-header > button.right {
      right: 1rem; }

.screen-footer {
  position: fixed;
  bottom: 0;
  right: 0;
  left: 0;
  overflow: hidden; }

.screen > .content {
  -webkit-overflow-scrolling: touch;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  overflow-y: auto; }