body {
    font-family: "Hiragino Kaku Gothic ProN", "メイリオ", sans-serif;
    margin: 0;
    padding: 0;
    background-color: #fefefe;
    color: #333;
    text-align: center;
  }
  
  header {
    background-color: #f9d5ec;
    padding: 1em 0;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  }
  
  header h1 {
    margin: 0;
    font-size: 2em;
  }
  
  header p {
    margin: 0.5em 0 0;
    color: #666;
  }
  
  .button-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    padding: 2rem;
  }
  
  .chem-button {
    display: inline-block;
    padding: 1em 1.5em;
    background-color: #c3f0ca;
    color: #333;
    font-weight: bold;
    text-decoration: none;
    border-radius: 12px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: all 0.3s;
    min-width: 180px;
  }
  
  .chem-button:hover {
    background-color: #b2e3bb;
    transform: translateY(-4px);
  }

  .scroll-container {
    overflow-x: auto;    
    -webkit-overflow-scrolling: touch;  
    width: 100%;        
  }
  
  .section-content {
    min-width: 700px;   
    display: inline-block; 
  }

  .social-icons {
    text-align: center;
    margin-top: 20px;
  }
  
  .icon-link {
    margin: 0 10px;
    font-size: 28px;
    color: #444;
    transition: color 0.3s ease;
  }
  
  .icon-link:hover {
    color: #1da1f2
  }
  
  .chem-section {
    margin-bottom: 2em;
  }
  
  .chem-section-title {
    font-size: 1.4em;
    font-weight: bold;
    color: #2b4ca1;
    margin-bottom: 0.5em;
    background-color: #e7f0ff;
    padding: 0.5em 1em;
    border-left: 5px solid #4a90e2;
  }
  
  .chem-section-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
  }