.r-box {
  outline: 1px solid #AAA;
  style: "font-family:Menlo, Monaco, Consolas, Courier New, monospace"
}
.blackbox {
  padding: 1em;
  background: red;
  color: white;
  border: 2px solid orange;
  border-radius: 10px;
}
.center {
  text-align: center;
}