body {
  font-family: sans-serif;
  text-align: center;
  background: #f5f5f5;
  margin: 0;
  padding: 2em;
}
#avatar svg {
  width: 200px;
  height: 200px;
}
.controls button {
  margin: 5px;
}
.hidden {
  display: none;
}