body {
  margin: 0;
  font-family: sans-serif;
  background: linear-gradient(to bottom right, #1f2a37, #2c3e50);
  color: white;
}
img {
  display: block;
  max-width: 100%;
}
.tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin: 20px 0;
}
.tab-button {
  background-color: #333;
  border: none;
  color: white;
  padding: 10px 15px;
  margin: 5px;
  cursor: pointer;
}
.tab-button.active {
  background-color: #555;
}
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
  padding: 10px;
}
.gallery img {
  height: 150px;
  object-fit: cover;
}
header, footer {
  text-align: center;
  padding: 20px;
}