* {
  padding: 0;
  margin: 0;
}

body {
  align-items: center;
  background-color: #3f51b5;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
}

h1 {
  margin: 15px;
}

#tetris {
  border: outset 0.2em #fff;
  height: 50vh;
}