.article-container {
    width: 960px;
    max-width: 100%;
    margin: 60px auto;
    padding: 20px 40px;
    background: #fff;
    box-shadow: 0 0 8px 0 rgba(0, 0, 0, 0.1);
  }
  
  .nav-container {
    position: fixed;
    right: 10px;
    top: 200px;
    background-color: #fff;
    border-radius: 5px;
    border: 1px solid #eee;
    box-shadow: 0 0 8px 0 rgba(0, 0, 0, 0.1);
    transform: translate(0, 0);
    transition: transform 500ms ease;
  }