.anuncio {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.anuncio img {
  max-width: 90%;
  max-height: 90%;
  border-radius: 10px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}

.cerrar-anuncio {
  position: absolute;
  top: 20px;
  right: 20px;
  background: #ff3b3b;
  color: #fff;
  border: none;
  padding: 10px 14px;
  font-size: 18px;
  cursor: pointer;
  border-radius: 50%;
}