body {
    font-family: 'Courier New', Courier, monospace;
    padding: 1em;
    background-color:ivory;
}

header {
    text-align: center;
}

nav li {
    display: inline-block;
    padding: 0em 1em;
}

nav li > a {
    font-size: 0.9em;
    color: dimgray;
}

nav li > a:hover {
    color: black;
    font-weight: bold;
}

#contenedor {
    margin: 2em 0em;
}

h1 {
    color: black;
}

h2 {
    color: dimgray;
}

h3 {
    color: darkgrey;
}

.half-div {
    width: 49%;
    display: inline-block;
    vertical-align: top;
}

footer {
    font-size: 0.8em;
    color: grey;
    margin: 1em;
}