*,
::before,
::after {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: black;
  color: white;
}

.header {
  position: fixed;
  top: 0;
  inset-inline: 0;
  background-color: grey;
}
.header .title {
  font-family: sans-serif;
  font-size: 18px;
  text-align: center;
}

canvas {
  border: 1px solid grey;
}

#display {
  text-align: center;
}