body, html {
  margin: 0;
  bottom: 0;
  min-height: 100vh;
  background: url('/img/bg.jpg') center / cover no-repeat;
  color: #fff;
}
#app {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 300;
  font-size: 3vw;
}
* {
  box-sizing: border-box;
}

@media (min-width: 1080px) {
  #app {
    font-size: 15px;
  }
}