body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
    sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  font-size: 16px;
  line-height: 1.5;
  color: #222;
}

article {
  margin-left: auto;
  margin-right: auto;
  max-width: 800px;
}

img {
  max-width: 50vw;
  max-height: 25vw;
  display: block;
  margin: auto;
}

form {
  display: flex;
  justify-content: center;
  gap: 0.5em;
  flex-flow: row wrap;
  max-width: 40vw;
  margin: auto;
  align-items: baseline;
}

button[type="submit"] {
  padding: 5px 20px;
  margin: 10px auto;
  float: right;
}

#greeting {
  margin: 10px auto;
  padding: 10px 60px;
  border: 1px solid #222;
}

#greeting:empty {
  display: none;
}