.title { font-family: Verdana,sans-serif;
    color: rgb(50, 50, 50);
    font-weight: normal;
    font-style: normal;
    font-size: xx-large;
    }
  .subtitle { font-family: Verdana,sans-serif;
    color: rgb(50, 50, 100);
    font-weight: normal;
    font-style: normal;
    font-size: x-large;
    }
  .subsubtitle { font-family: Verdana,sans-serif;
    color: rgb(50, 50, 100);
    font-weight: normal;
    font-style: normal;
    font-size: normal;
    }

  .italico { font-family: Verdana,sans-serif;
    color: rgb(50,50,50);
    font-weight: normal;
    font-style: italic;
    font-size: small;
    }
  .italicr{ font-family: Verdana,sans-serif;
    color: rgb(50,50,50);
    font-weight: normal;
    font-style: italic;
    font-size: normal;
    }
  .authors{ font-family: Verdana,sans-serif;
    color: rgb(90,90,90);
    font-weight: small;
    font-style: normal;
    font-size: small;
    }
  .norma { font-family: Verdana,sans-serif;
    color: rgb(100,100,100);
    font-weight: normal;
    font-style: normal;
    font-size: normal;
    }
  a {text-decoration: none}
  a:link {color: #505050}
  a:visited {color: #505050}
  a:hover {color: rgb(150,150,150)}
  a:active {color: rgb(150,150,150)}
  body {color: rgb(200,200,200);
    background-color: rgb(255, 255, 255);
    }