html, body { background: #fff; margin: 0; }
body { font-family: sans-serif; padding: 20px; }
.hint { color: #666; font-size: 13px; max-width: 600px; }
#myDiv { width: 600px; height: 300px; }
#info {
  margin-top: 0.25rem; padding: 0.5rem 1rem;
  border: 1px dashed #aaa; min-height: 1.5em;
  font-size: 18px;
  width: 600px; box-sizing: border-box;
}