body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header {
  background-color: #222;
  color: white;
  padding: 1em;
  text-align: center;
}
button {
  padding: 0.5em 1em;
  margin-top: 1em;
  cursor: pointer;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1em;
  padding: 1em;
}
.card {
  border: 1px solid #ccc;
  border-radius: 0.5em;
  padding: 1em;
  background-color: #f9f9f9;
  text-align: center;
}
.card img {
  width: 100%;
  height: auto;
}
.oculto {
  display: none;
}
#spinner {
  text-align: center;
  font-size: 1.2em;
  margin: 1em;
}