<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Copy content on click</title>
</head>
<body>
  <div class="colors-to-choose">
    <div class="color" style="background: rgb(55, 175, 233);">#37AFE9</div>
    <div class="color" style="background: rgb(52, 75, 100);">#344B64</div>
    <div class="color" style="background: rgb(153, 222, 255);">#99DEFF</div>
    <div class="color" style="background: rgb(250, 251, 251);">#FAFBFB</div>
    <div class="color" style="background: rgb(233, 235, 243);">#E9EBF3</div>
    <div class="color" style="background: rgb(255, 255, 255);">#FFFFFF</div>
    <div class="color" style="background: rgb(0, 110, 169);">#006EA9</div>
  </div>  
</body>
</html>
.colors-to-choose {
  display: flex;
  justify-content: center;
  flex-wrap: nowrap;
    
    &>div {
      padding: 10px;
      margin: 20px 5px 0;
  }
}
View Compiled 
var color = document.querySelectorAll('.color') //DOM selector

//Loop through all elements and attaching event listener
color.forEach(el => {
  el.addEventListener('click',copyText)
})

// function for selecting the text of an element based on the event.target (supporting IE)
function selectText() {
    var element = event.target
    var range;
    if (document.selection) {
        // IE
        range = document.body.createTextRange();
        range.moveToElementText(element);
        range.select();
    } else if (window.getSelection) {
        range = document.createRange();
        range.selectNode(element);
        window.getSelection().removeAllRanges();
        window.getSelection().addRange(range);
    }
}

// function for copying selected text in clipboard
function copyText() {
    selectText();
    alert('Color code ' + event.target.innerText + ' copied in clipboard')
    document.execCommand("copy");
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.