*{box-sizing:border-box}

html,body{
  margin:0;
  min-height:100%;
  background:#f5f7f2;
  font-family:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo",sans-serif;
}

img{max-width:100%}

button,input,textarea{font-family:inherit}

.app{
  width:100%;
  max-width:430px;
  min-height:100vh;
  margin:0 auto;
  background:#fff;
  overflow-x:hidden;
}

.screen{display:none}
.screen.active{display:block}