#barraCarga {
  display: none;
  text-align: center;
  margin-top: 20px;
}

.spinner {
  margin: 0 auto;
  width: 40px;
  height: 40px;
  border: 6px solid #f3f3f3;
  border-top: 6px solid #3498db;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0%   { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}