div.container {
    width: 100%;
    border: 1px solid gray;
}
#contenido {
    width: 100%;
}
header {
    padding: 1em;
    color: black;
    clear: left;
    text-align: center;
}

footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    padding: 1em;
    color: white;
    font-family: arial;
    background-color: #0000CD;
    clear: left;
    text-align: center;
}

nav {
    float: right;
    max-width: 160px;
    margin: 0;
    padding: 1em;
}

nav ul {
    list-style-type: none;
    padding: 0;
}
   
nav ul a {
    text-decoration: none;
}

#informes {
    float: right;
    max-width: 260px;
    margin: 0;
    padding: 1em;
}

article {
    margin-left: 170px;
    border-left: 1px solid gray;
    padding: 1em;
    overflow: hidden;
}
#info {
  width: 255px;
  height: 258px;
  background-image: url("../images/libreta.jpg");
}
#info td {
  margin: 20px;
  padding: 30px;
  padding-top: 5px;
}
#info th {
  height: 40px;
}