* {
  margin: 0;
  padding: 0;
  font-size: 16px;
  font-family: 'Roboto', sans-serif;
}

.div-flex {
  height: 400px;
  border-top: 1px solid greenyellow;
  border-bottom: 1px solid greenyellow;

  display: flex;
  justify-content: center;
  align-items: center;
}