.fondo{
    background-color: linear-gradient(135deg, #ff0000, #ff8000, #ffcc00);
    color: white; 
    border-radius: 15px; 
    box-shadow: 0 4px 15px rgba(0,0,0,0.3); 
}
.amarillo{
    background-color: #ffcc00;
}
.rojo{
    background-color: #ff0000;
}
.naranjado{
    background-color: #ff8000;
}