.popup {
  display: none;
  position: fixed;
  z-index: 999;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.9);
  text-align: center;
}

.popup-conteudo {
  max-width: 90%;
  max-height: 80%;
  margin-top: 60px;
}

.fechar {
  position: absolute;
  top: 20px;
  right: 35px;
  color: #fff;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
}

.anterior, .proxima {
  cursor: pointer;
  position: absolute;
  top: 50%;
  color: white;
  font-size: 60px;
  padding: 10px;
  user-select: none;
  transform: translateY(-50%);
}

.anterior {
  left: 20px;
}

.proxima {
  right: 20px;
}