/* CSS variables */
:root{
  --primary:  #fd0;
  --shadow:  0 1px 5px rgba(0,0,0,.5);
}

/* Every elements */
*,
*:before,
*:after{
  box-sizing: border-box;
}

html,
body{
  margin: 0;
  padding: 0;
  height: 100%;
}
html{
  touch-action: manipulation;
}
body{
  background-color: #f1f1f1;
  perspective:  100px;
}