body {
  margin: 0;
  padding: 30px;
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
}

.btn {
  display: block;
  margin: 0 auto 30px;
  padding: 12px 24px;
  font-size: 16px;
  cursor: pointer;
  border: none;
  border-radius: 10px;
  background-color: #222;
  color: white;
}

.posts {
  list-style: none;
  padding: 0;
  margin: 0 auto;

  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;

  max-width: 1000px;
}

li {
  background-color: white;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

li img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}