body {
    font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen, Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
    font-size: 16px;
    color: #2c3e50;
  }
main {
  padding: 3.6rem 2rem 0;
  max-width: 960px;
  margin: 0 auto;
}
  img {
    border-radius: 50%;
    max-height: 280px;
    display: block;
    margin: 3rem auto 1.5rem;
    max-width: 100%;
  }

  .rudy {
    text-align: center;
  }

  .rudy h1 {
    margin: 1.8rem auto;
    font-size: 3rem;
  }

  .desc {
    margin: 1.8rem auto;
    max-width: 35rem;
    font-size: 1.6rem;
    line-height: 1.3;
    color: #6a8bad;
  }

  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    font-weight: 600;
    line-height: 1.25;
  }

  header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 20;
    right: 0;
    height: 3.6rem;
    background-color: #fff;
    box-sizing: border-box;
    border-bottom: 1px solid #fff;
    padding: .7rem 1.5rem;
    line-height: 2.2rem;
  }

  .sidebar {
    font-size: 15px;
    background-color: #fff;
    width: 20rem;
    position: fixed;
    z-index: 10;
    margin: 0;
    top: 3.6rem;
    left: 0;
    bottom: 0;
    box-sizing: border-box;
    border-right: 1px solid #fff;
    overflow-y: auto;
  }

  .nav-links,
  .nav-link {
    flex: 1;
    display: inline-block;
  }

  .nav-link {
    position: relative;
    margin-left: 1.5rem;
    line-height: 2rem;
  }

  .can-hide {
    padding-left: 1.5rem;
    box-sizing: border-box;
    background-color: #fff;
    white-space: nowrap;
    font-size: .9rem;
    position: absolute;
    right: 1.5rem;
    top: .7rem;
    display: flex;
  }

  a {
    text-decoration: none;
    font-weight: 500;
  }

  .name {
    font-size: 1.3rem;
    font-weight: 600;
    color: #2c3e50;
    position: relative;
  }

  .sidebar-button {
    display: none;
    width: 1.25rem;
    height: 1.25rem;
    position: absolute;
    padding: .6rem;
    top: .6rem;
    left: 1rem;
    cursor: pointer;
  }
  .sidebar-button .icon {
    display: block;
    width: 1.25rem;
    height: 1.25rem
  }

  .sidebar .nav-links .nav-link {
    display: block;
    line-height: 1.25rem;
    font-size: 1.1em;
    padding: .5rem 0 .5rem 1.5rem
  }

  @media only screen and (max-width: 719px) {
    header {
      padding-left: 4rem;
    }

    .sidebar {
      top: 0;
      padding-top: 3.6rem;
      transform: translateX(-100%);
      transition: transform .2s ease;
    }

    .sidebar-open {
      transform: translateX(0);
    }

    .can-hide {
      display: none;
    }
    .sidebar-button {
      display: block;
    }
  }

  @media only screen and (min-width: 720px) {
    .sidebar {
      display: none;
    }
  }

  @media only screen and (max-width: 959px) {
    .sidebar {
      font-size: 15px;
      width: 16.4rem;
    }
  }

  @media only screen and (max-width: 419px) {
    img {
      max-height: 210px;
      margin: 2rem auto 1.2rem;
    }

    .rudy h1 {
      margin: 1.2rem auto;
      font-size: 2rem;
    }

    .desc {
      margin: 1.2rem auto;
      font-size: 1.2rem;
    }
  }