body:after {
  content: "LO INVITAMOS A REALIZAR EL PAGO, SU FACTURA HA VENCIDO. EVITE CORTE DEL SERVICIO Y VALORES POR REACTIVACIÓN"; 
  font-size: 3em;  
  color: rgba(255,0,0,0.2);
  z-index: 9999;
 
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  top: 0;
  right: 0px;
  bottom: 0;
  left: 50px;
    
  -webkit-pointer-events: none;
  -moz-pointer-events: none;
  -ms-pointer-events: none;
  -o-pointer-events: none;
  pointer-events: none;

  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  user-select: none;
}