div {
  display: flex;
  flex-direction: column;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
}

* {
  border-style: solid;
  border-width: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Helvetica;
}

html, body {
  margin: 0;
  padding: 0;
}