*{margin: 5px;
    padding: 5px;}

#contenedor, header, main, aside, footer {
    border: solid 1px black;
    margin:10px;
    padding:10px;
}

#logo_uba {
    width: 100px;
    }

.realcedetexto {
    color: #FF6103;
}

main {
    width: 65%;
    float: right;
}

aside {
    width: 25%;
    float: left;
}

#retrato {
    width: 150px;
    float: none;
}
footer {
    clear: both;
}