body {
    background-image:url(../images/logo_a.gif);
    color: white;
    font-family:'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 
                'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    margin: 20px;
    padding: 5px;               
}
#reglas {
    display: grid;
    /* ajusta el contenido al centro */
    justify-content:right ;
    text-align:justify;       
    padding-left: 5%;
    padding-right: 3%;
}
#cuadro {
    background-color: #000080;
    border: #000080 groove 2px;
    min-width: 60%;
    margin: 5px auto;
    padding: 10px;    
}
thead > tr > th {
    color:gold;
}
a::first-letter {
    cursor:pointer;
    color:gold;
}
a {
    color:white;
    text-decoration-line:none;
}
a:hover {
    cursor:pointer;
    color:gold;
}