body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f9f9f9;
    color: #333;
  }
  
  header {
    background-color: #333;
    color: white;
    padding: 20px 40px;
    text-align: center;
  }
  
  nav {
    background-color: #555;
    padding: 10px 40px;
    display: flex;
    justify-content: center;
    gap: 30px;
  }
  
  nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    padding: 8px 15px;
    border-radius: 5px;
    transition: background-color 0.3s ease;
  }
  
  nav a:hover {
    background-color: #777;
  }
  
  #nav-category > a {
    border-radius: 20px;
  }
  
  #nav-category > a:hover {
    background-color: pink;
  }
  
  #nav-category {
    float: right;
  }
  
  #nav-line {
    width: 98%;
    height: 1px;
    margin-top: 30px;
    background-color: grey;
  }
  
  main {
    display: flex;
    gap: 20px;
    padding: 20px 40px;
    max-width: 1200px;
    margin: 0 auto;
  }
  
  article {
    background-color: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    flex: 1;
  }
  
  footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 15px 40px;
    margin-top: 40px;
  }
  
  .sns-item {
    display: block;
    margin-bottom: 5px;
  }
  
  .sns-item > a {
    display: flex;
    align-items: center;
  }
  
  #profile-container {
    display: flex;
  }
  
  #profile {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  
  #sns-container {
    display: flex;
    justify-content: space-around;
    align-items: center;
  }
  
  #profile-container > img {
    border-radius: 200px;
  }