#menu{
    float: left;
    width: 150px;
    height: 100px;
    border: 3px solid #ececff;
    padding: 7px;
    padding-left: 8px;
    border-right-color: #006;
}
#menu a{
    padding: 3px 1px;
    display: block;
    width: 100%;
    text-decoration: none;
    font-weight: bold;
    border-bottom: 1px solid gray;    color: #606;
}
#menu a:hover{
    background-color: #99c;
    color: #fff;
}
body {
    background-color: ##ececff;
    font-family: Geneva, Arial, Helvetica, sans-serif;
}
.titulos {
    color: #036;
}
#contenidos{
    float:left;
    width:480px;
    min-height: 250px;
    border: 3px solid grey;
    margin-left: 10px;
    padding: 5px;
    padding-bottom: 8px;
    background-color: #fff;
}
* html #contenidos{ /*estilo solo para IE ya que no se admite la propiedad min-height*/
    height: 400px;
}