.blocoprincipal{
    width: 900px;
    height: auto;
    background-color: black;
    border: white double 4px;
    margin: auto;
    padding: 10px;
}

a{
    color: #e5314e;
    text-shadow: #570f1b 2px 2px;
    text-decoration: none;
}

a:hover{
    color: #ad1f36;
    text-shadow: #39040d 2px 2px;
}