html, body {
  margin: 0;
  height: 100%;
}

.container {
  display: flex;
  align-items: center;
  height: 100%;
  justify-content: center;
  flex-wrap: none;
}

.frame {
  width: 60%;
  background-color: lightyellow;
  border: 1px solid #000;
}

#letter {
  margin: 4rem;
}