body {
  max-width: 100vw;
  overflow-x: hidden;
  background: url("../img/bg.jpg") no-repeat;
  background-size: cover;
}

header {
  padding: 20vw 0 0vw;
}
header .logo img {
  display: block;
  margin: 0 auto;
}

#app {
  padding: 4vw;
}

.description {
  text-align: center;
}
.description .title {
  font-size: 7vw;
  font-weight: normal;
}
.description .subtitle {
  font-size: 4vw;
  font-weight: normal;
  letter-spacing: 1vw;
  text-indent: 1vw;
}

.imagebox {
  padding: 4vw;
}

.download {
  display: flex;
  flex-direction: column;
  row-gap: 2vw;
  margin: 10vw 0 5vw;
}
.download > a {
  display: block;
  width: 38vw;
  margin: 0 auto;
  font-size: 4vw;
  font-weight: bold;
  text-align: center;
  padding: 3vw 4vw;
  border-radius: 60vw;
  text-decoration: none;
  color: #f50931;
  background-color: #fff;
}

.warning {
  text-align: center;
  font-size: 3vw;
}