<html>
  <head>
    <title>Hello, world.</title>

    <style>
      body {
        font-family: courier, monospace;
        padding: 10%;
        text-align: center;
        font-size: 13px;
        line-height: 1.65em;
      }

      img {
        margin: 10px 10px 0;
      }
    </style>
  </head>

  <body>
    <p>Hello, world.</p>
    <p>
      <a href="human.txt">Check out human.txt</a><br>
      <a href="https://github.com/muan/hello-world">Contribute</a>
    </p>

    <script type="text/javascript">
      fetch('./human.txt').then(function (data) {
        return data.text()
      }).then(function (data) {
        const logins = data.split('\n')
        logins.forEach(function (login) {
          if(!login) return

          const a = document.createElement('a')
          a.href = 'https://github.com/' + login
          const image = new Image(50, 50)
          image.src = 'https://github.com/' + login + '.png?size=50'
          a.appendChild(image)
          document.body.appendChild(a)

          image.onerror = function () {
            a.remove()
          }
        })
      })
    </script>
  </body>
</html>

<html>
  <head>
    <title>Hello, world.</title>

    <style>
      body {
        font-family: courier, monospace;
        padding: 10%;
        text-align: center;
        font-size: 13px;
        line-height: 1.65em;
      }

      img {
        margin: 20px 10px 0;
      }
    </style>
  </head>

  <body>
    <p>Hello, world.</p>
    <p>
      <a href="human.txt">Check out human.txt</a><br>
      <a href="https://github.com/muan/hello-world">Contribute</a>
    </p>

    <script type="text/javascript">
      fetch('./human.txt').then(function (data) {
        return data.text()
      }).then(function (data) {
        const logins = data.split('\n')
        logins.forEach(function (login) {
          if(!login) return

          const a = document.createElement('a')
          a.href = 'https://github.com/' + login
          const image = new Image(50, 50)
          image.src = 'https://github.com/' + login + '.png?size=100'
          a.appendChild(image)
          document.body.appendChild(a)

          image.onerror = function () {
            a.remove()
          }
        })
      })
    </script>
  </body>
</html>

Add margin & take care of retina
Add margin & take care of retina