body {
  background-color: #fff;
  font-family: Arial, sans-serif;
}

/* Contenedor */
.box {
  position: relative;
  border: 1px solid gray;
  border-radius: 6px;
  background-color: #e6f7ff;
  margin: 2rem 0rem 0rem 0rem;
  padding: 1rem 1rem 0.5rem 1rem;
}

/* T�tulo flotante */
.box h2 {
  position: absolute;
  top: -0.7em;
  left: 1rem;
  background-color: #e6f7ff;
  margin: 0;
  padding: 0 1.5rem;
  font-size: 1.3em;
  border-radius: 4px;
}

.btn-margin {
  margin: 1rem 0rem 0rem 0rem;
  padding: 0.5rem 3rem 0.5rem 3rem;
}

.result {
  font-size: 1.1em;
}

footer {
  color: gray;
  font-size: 0.8em;
}