.timbre{
    background-image: url("https://fundacionacenmaule.cl/assets/images/timbresolo.jpg");
    background-repeat: no-repeat;
    background-position: top right; /* arriba derecha */
    /* opcional */
    background-size: 200px auto;    /* ajusta tamaño */
}

/* Overlay ocupa TODO el viewport */
#popup-overlay{
  position: fixed;       /* ← clave */
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;

  display: flex;
  align-items: center;   /* centra vertical */
  justify-content: center; /* centra horizontal */

  background: rgba(0,0,0,.6);
  z-index: 99999;        /* encima de TODO */
}

/* Popup centrado */
#popup{
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
}

/* Imagen responsive */
#popup img{
  max-width: 100%;
  height: auto;
  display: block;
}

/* Botón cerrar */
#popup-close{
  position: absolute;
  top: -12px;
  right: -12px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: #000;
  color: #fff;
  font-size: 22px;
  cursor: pointer;
}