kbd {
  display: inline-block;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 0 0.5em;
  margin: 0.1 0.2em;
  box-shadow: 0 1px 0px rgba(0, 0, 0, 0.2), 0 0 0 2px #fff inset;
  background-color: #f7f7f7;
}

.bg-true {
  color: ForestGreen;
  font-weight: bold;
}

.bg-false {
  color: FireBrick;
  font-weight: bold;
}