body {
  margin: 0;
  font-family: sans-serif;
  background-color: #f0f0f0;
}

.main-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  background: white;
  min-height: 100vh;
  box-sizing: border-box;
}

h1 {
  text-align: center;
  font-size: 24px;
  margin-bottom: 20px;
}

#osi-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
}

/* ここからカードスタイル */
.osi-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 120px;
  padding: 10px;
  text-decoration: none;
  background: #ffffff;
  border: 1px solid #ddd;
  border-radius: 10px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s;
}

.osi-card:hover {
  transform: scale(1.05);
}

.osi-card img {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
}

.osi-text {
  margin-top: 10px;
  font-size: 14px;
  color: #333;
  text-align: center;
}

#pagination button {
  margin: 0 5px;
  padding: 6px 12px;
  border: none;
  background-color: #ddd;
  border-radius: 4px;
  cursor: pointer;
}

#pagination button.active {
  background-color: #3498db;
  color: white;
}

#pagination button:hover {
  background-color: #bbb;
}