* {
  font-family: Arial, Helvetica, sans-serif;
}

body {
  background-color: black;
  display: block;
  margin: 10px;
  }
strong {
    color: green;
  }
h1 {
  font-size: 1.2em;
  color: #999;
  margin-bottom: 0;
}
h2 {
  font-size: 2em;
  margin-top: 0;
  padding-top: 0;
}

p{
  color: #607D8B;
  }
#principal-caja{
    color: black;
    background-color: #CFD8DC;
    border-radius: 8px 8px;
    padding: 30px;
}