body {
        padding-left: 2px;
        padding-right: 2px;
        font-family: Georgia, "Times New Roman",
            Times, serif;
        color: purple;
        background-color: lightblue }
    ul.navbar {
        list-style-type: none;
        padding: 0;
        margin: 0;
        position: absolute;
        top: 2em;
        left: 1em;
        width: 9em }
      h1 {
        font-family: Helvetica, Geneva, Arial,
              SunSans-Regular, sans-serif;
            color: white; }
        h1.h1_customized{
            font-family: Helvetica, Geneva, Arial,
            SunSans-Regular, sans-serif;
          color: red;
        }
      ul.navbar li {
        background: white;
        margin: 0.5em 0;
        padding: 0.3em;
        border-right: 1em solid black }
      ul.navbar a {
        text-decoration: none }
      a:link {
        color: blue }
      a:visited {
        color: purple }
    .div_centrado{
        background-color: blue;
    }