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About the <head>

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CSS

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HTML 

              
                <html>
  <head>
  </head>
  <body>
    <!-- custom handle svg -->
    <svg style="display:none;">
      <defs>
        <g id="handle" stroke-width="2" fill="#fff" stroke="#000">
        <g transform="translate(-2.000000, 0.000000)">
          <path d="M11.5201888,0.98376551 C13.6952297,0.98376551 15.8701457,1.81608292 17.5295957,3.48022772 C19.1901518,5.14549409 20.0201888,7.32814902 20.0201888,9.51067916 C20.0201888,11.5892784 19.2673214,13.6679882 17.7611695,15.299761 L17.529597,15.541119 L16.751934,16.320985 L16.3895078,16.6844379 L15.7908391,17.2848025 L11.5201888,21.5675509 L6.56546871,16.5987948 L6.06410518,16.096011 C4.16105924,14.1875741 3.18084887,11.8968269 3.09234842,9.65314602 C3.00270091,7.38038455 3.8309449,5.16482966 5.5107793,3.48023034 C7.17023192,1.81608292 9.34514792,0.98376551 11.5201888,0.98376551 Z M11.5,6 C10.5335017,6 9.65850169,6.39175084 9.02512627,7.02512627 C8.39175084,7.65850169 8,8.53350169 8,9.5 C8,10.4664983 8.39175084,11.3414983 9.02512627,11.9748737 C9.65850169,12.6082492 10.5335017,13 11.5,13 C12.4664983,13 13.3414983,12.6082492 13.9748737,11.9748737 C14.6082492,11.3414983 15,10.4664983 15,9.5 C15,8.53350169 14.6082492,7.65850169 13.9748737,7.02512627 C13.3414983,6.39175084 12.4664983,6 11.5,6 Z" id="Combined-Shape"></path>
        </g>
    </g>
    </defs>
    </svg>
    <!-- / custom handle svg -->
    <div class="wrap">
      <div class="half">
        <div class="colorPicker"></div>
      </div>
      <div class="half readout">
        <span class="title">Values:</span>
        <div id="values"></div>
        <span class="title link">Check out <a href="https://iro.js.org?ref=codepen" target="_blank">https://iro.js.org</a> for more info!</span>
      </div>
    </div>
  </body>
</html>
!

CSS 

              
                body {
  color: #fff;
  background: #171F30;
}

.wrapper svg {
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  
  .half {
    width: 50%;
    padding: 32px 0;
  }
}

.title {
  font-family: sans-serif;
  line-height: 24px;
  display: block;
  padding: 8px 0;
}

.readout {
  margin-top: 32px;
  font-family: monospace;
}

.link {
  margin-top: 16px;
  
  a {
    color: MediumSlateBlue;
  }
}
!

JS 

              
                // Create a new color picker instance
// https://iro.js.org/guide.html#Getting-Started
var colorPicker = new iro.ColorPicker(".colorPicker", {
  // color picker options
  // Option guide: https://iro.js.org/guide.html#Color-Picker-Options
  width: 280,
  color: "rgb(255, 0, 0)",
  borderWidth: 1,
  borderColor: "#fff",
  handleSvg: '#handle',
  handleProps: {x: -8, y: -20}
});

var values = document.getElementById("values");

// https://iro.js.org/guide.html#color-change
colorPicker.on(["color:init", "color:change"], function(color){
  // Show the current color in different formats
  // Using the selected color: https://iro.js.org/guide.html#Using-the-Selected-Color
  values.innerHTML = [
    "hex: " + color.hexString,
    "rgb: " + color.rgbString,
    "hsl: " + color.hslString,
  ].join("<br>");
});
!
999px

Console