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HTML

About HTML Preprocessors

HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

Add External Stylesheets/Pens

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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Packages

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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <svg xmlns="http://www.w3.org/2000/svg" version="1.1" id="svg">
  <defs>
    <filter id="colorFilter">
      <feColorMatrix 
        color-interpolation-filters="sRGB"
        id="feColorMatrix"
        type="matrix"
        values="1     0     0       0      0
                0     1     0       0     0
                0     0     1       0     0
                0     0     0       1     0 "/>
    </filter>
  </defs>
</svg>

<div class="container">
  <div class="icon-color">  
    <span>Does your icon have a</span>
    <input type="radio" id="white" name="drone" value="white" checked>
    <label for="white" id="whiteLabel">white</label>
    <span>or</span>
    <input type="radio" id="black" name="drone" value="black">
    <label for="black" id="blackLabel">black</label>
    <span>fill</span>
    
    <div class="icon"></div>
  </div>
  
 

  <div class="hexForm">
    <label for="hex">Input HEX code</label>
    <span class="hash">#</span>
    <input type="text" class="hexInput" name="name" required maxlength="6" pattern="[0-9A-Fa-f]{6}$" title="Hex codes must be 6 digits" autocomplete="off">
    <br>
    <button class="submitButton">submit</button>
    <button class="clearButton">clear</button>
    <p><small class="error"> </small></p>
  </div>
  <div class="codeSnippets">
    <p><small>click to copy code snippets</small></p>
    <div class="codeSnippet">
      <div class="copydiv"></div>
      <pre class="codeSnippet-svg">
        <code class="SVGCode">
        &#x3C;svg id=&#x22;svg&#x22;&#x3E;
          &#x3C;defs&#x3E;
            &#x3C;filter id=&#x22;colorFilter&#x22;&#x3E;
              &#x3C;feColorMatrix 
                color-interpolation-filters=&#x22;sRGB&#x22;
                type=&#x22;matrix&#x22;
                values=&#x22;<strong class="rVal">1  </strong> 0   0   0   0
                        0   <strong class="gVal">1 </strong>  0   0   0
                        0   0   <strong class="bVal">1 </strong>  0   0
                        0   0   0   1   0 &#x22;/&#x3E;
            &#x3C;/filter&#x3E;
          &#x3C;/defs&#x3E;
        &#x3C;/svg&#x3E;
        </code>
      </pre>
    </div>
    <div class="codeSnippet">
      <pre  class="codeSnippet-css">
        <code class="CSSCode">
        .icon{
          filter: <span class="invert"></span>url(#colorFilter);
        }
        </code>
       </pre>
    </div>
    <p><small class="info"></small></p>
  </div>
</div>
!

CSS 

              
                :root{
  --red: #cd1c47;
  --green: #1ccd81;
  --blue: #1c96cd;
  --background: #1a2b34;
}

.rVal, .gVal, .bVal, .aVal {
  font-weight: bold;
}

.rVal{
  color: var(--red);
}
.gVal{
  color: var(--green);
}
.bVal{
  color: var(--blue);
}

#svg {
  display: none;
}

body {
  background-color: var(--background);
  color: #555;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, 
   "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", 
   "Fira Sans", "Droid Sans", "Helvetica Neue", 
   sans-serif;
  font-weight: 300;
  font-size: 0.8rem;
}

p {
  margin: 0.2rem;
}

.container {
  background-color: #fff;
  min-width: 450px;
  width: calc(100vw - 100px);
  height: auto;
  padding: 3rem;
  box-sizing: border-box;
  display: flex;
  justify-content: space-around;
  align-items: center;
  flex-direction: column;
  box-shadow: 3px 3px 8px 2px #00000030;
}

.icon {
  padding: 2rem;
  border-radius: 10%;
  margin: 20px auto;
  height: 100px;
  width: 100px;
  filter: url(#colorFilter);
  -webkit-filter: url(#colorFilter);
  background-position: center; /* Center the image */
  background-repeat: no-repeat; /* Do not repeat the image */
  background-size: 80%; /* Resize the background image to cover the entire container */
}

.blackIcon {
  filter: invert(100%) url(#colorFilter);
  -webkit-filter: invert(100%) url(#colorFilter);
}

// input section
.hexForm {
  text-align: center; 
}
label {
  display: block;
  margin-bottom: 1rem;
}
input {
    border: none;
    border-bottom: 1.5px solid var(--background);
    font-size: 14px;
    outline: none;
    margin-bottom: 15px;
    color: #828186;
    font-weight: 300;
}
input:valid ~ .submitButton {
  border: 1.5px solid var(--background);
}
input:valid ~ .submitButton:active, input:valid ~ .submitButton:focus {
  border: 1.5px solid #ddd;
}
.error {
  margin-top: 1rem;
  color: #af2929;
}
button {
    display: inline-block;
    border: 1.5px solid #eee;
    padding: 0.5rem 1rem;
    margin: 1rem;
    min-width: 100px;
    text-decoration: none;
    background: #eee;
    color: #555;
    font-size: 0.8rem;
    cursor: pointer;
    text-align: center;
    transition: all 250ms ease-in-out, 
                transform 150ms ease;
    -webkit-appearance: none;
    -moz-appearance: none;
}
button:hover,
button:focus {
    background: #ddd;
    border: 1.5px solid var(--background);  
}
button:focus {
    outline: none;
    border: 1.5px solid #ddd;
}
button:active {
    transform: scale(0.99);
}
.hash {
  color: var(--background);
  font-weight: 400;
}
.clear {
  border: 1.5px solid var(--background);
}

// codeblocks
.codeSnippets {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  margin-top: 1rem;
}
.codeSnippet {
  margin: 0 10px;
}
.codeSnippets p {
  text-align: center;
  display: none;
}
.codeSnippet-svg, .codeSnippet-css {
  position: relative;
}
pre {
  background-color: #1a2b34;
  padding-right: 1.5rem;
  color: #bcbcbc;
  font-size: 0.8rem;
  
}

// copy paste
.clipboard pre {
  cursor: pointer;
}
.clipboard .codeSnippet-svg, .clipboard .codeSnippet-css {
  overflow: hidden;
}
.clipboard .codeSnippet-svg:after, .clipboard .codeSnippet-css:after {
  position: absolute;
  content: "copied to clipboard";
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  opacity: 0;
  color: #fff;
  text-size: 1.5rem;
  background-color: var(--background);
  transition: all 150ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}
.clipboard .success.codeSnippet-svg:after, .clipboard .success.codeSnippet-css:after {
  opacity: 0.8;
  transform: scale(1.23);
}
.clipboard .codeSnippets p {
  display: block;
}

// radio buttons

#black:checked ~ #blackLabel {
  font-weight: bold;
}
#white:checked ~ #whiteLabel {
  font-weight: bold;
}

label {
  display: inline-block;
}

#black:checked ~ .icon {
  background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/756881/icon-instagram-black.svg");
}

#white:checked ~ .icon {
  background-color: #1a2b34;
  background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/756881/icon-instagram.svg");
}

// media queries
@media screen and (min-width: 700px) { 
  .container {
    width: auto;
    height: auto;
    padding: 3rem;
}
}
!

JS 

              
                const svg = document.querySelector("#svg")
const feColorMatrix = document.querySelector("#feColorMatrix");
let numberList = [1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0];
const submitButton = document.querySelector(".submitButton");
const body = document.querySelector("body");
const SVGCode = document.querySelector(".SVGCode");
const blackIcon = document.querySelector("#black");
const whiteIcon = document.querySelector("#white");
const icon = document.querySelector(".icon");
const SVGCodeCont = document.querySelector(".codeSnippet-svg");
const CSSCodeCont = document.querySelector(".codeSnippet-css");
const CSSCode = document.querySelector(".CSSCode");
const info = document.querySelector(".info");
const invert = document.querySelector(".invert");
const hexInput = document.querySelector(".hexInput");
const clearButton = document.querySelector(".clearButton");
const rVal = document.querySelector(".rVal");
const gVal = document.querySelector(".gVal");
const bVal = document.querySelector(".bVal");
const error = document.querySelector(".error");

// ^ match beginning
// # a hash
// [a-f0-9] any letter from 0-9 and a-f
// {6} the previous group appears exactly 6 times
// $ match end
// i ignore case
function check(hex){
  if (/[0-9A-F]{6}$/i.test(hex)){
    return true;
  }
}

function hexTofeColorMatrix(hex){
  let RGB = [];
    for (let i = 0; i < hex.length; i+=2) { 
      const firstDigit = parseInt(hex[i], 16);
    
      const firstDigitPartial = firstDigit * 16;
    
      let RGBValue = parseInt(hex[i+1], 16) + firstDigitPartial;
      
      RGBValue = RGBValue / 255;
      
      RGBValue = RGBValue.toFixed(2);
      
      RGB.push(RGBValue);
    }
    
    const red = RGB[0];
    const green = RGB[1];
    const blue = RGB[2];

    numberList[0] = red;
    numberList[6] = green;
    numberList[12] = blue; 
    
    rVal.innerHTML = RGB[0];
    gVal.innerHTML = RGB[1];
    bVal.innerHTML = RGB[2];
  
    feColorMatrix.setAttribute("values" , numberList.join(' '));
};

function backgroundColour(hex){  
  body.style.setProperty("--background", "#" + hex)
}

function clickToCopy(codeContainer, code){
  navigator.clipboard.writeText(code.innerText);
    codeContainer.classList.add("success");
  setTimeout(function(){ 
    codeContainer.classList.remove("success");
  }, 800);
}

// click to copy CSS and SVG if there's a clipboard function
(() => {
   if(navigator.clipboard) {
      body.classList.add("clipboard");
      CSSCodeCont.addEventListener("click", () => {
        clickToCopy(CSSCodeCont, CSSCode);
      });
      SVGCodeCont.addEventListener("click", () => {
        clickToCopy(SVGCodeCont, SVGCode);
      });
   }
})()

function iconColour(){
  if (whiteIcon.checked){
     icon.classList.remove("blackIcon");
     invert.innerHTML = "";
     hexTofeColorMatrix("ffffff");
     info.innerHTML = "";
   }
}

blackIcon.addEventListener("click", iconColour);
whiteIcon.addEventListener("click", iconColour);

// check if hex is valid, if so change background color var and convert hex
// if not prompt user to enter a valid hex
submitButton.addEventListener("click", event => {
   if (check(hexInput.value)) {  
      hexTofeColorMatrix(hexInput.value);
      backgroundColour(hexInput.value);
      error.innerHTML = " "
   } else {
     error.innerHTML = "please input a valid 6 digit hex code"
   }
  if (blackIcon.checked){
    icon.classList.add("blackIcon");
    invert.innerHTML = "invert(100%) ";
    info.innerHTML = "Black icons have to be inverted to white before using the SVG colour filter";
  } else {
    info.innerHTML = " ";
  }
});

clearButton.addEventListener("click", event => {
    hexInput.value = "";
    clearButton.classList.remove("clear");
    if (blackIcon.checked){
      hexTofeColorMatrix("000000");
    } else {
      hexTofeColorMatrix("ffffff");
    }
});

// Add an active visual cue to clear button when a hex code is entered
hexInput.addEventListener("input", event => {
  if(hexInput.value.length > 0) {
    clearButton.classList.add("clear");
  } else {
    clearButton.classList.remove("clear");
  }
});

// Execute a function when the user releases a key on the keyboard
hexInput.addEventListener("keyup", event => {
  // Number 13 is the "Enter" key on the keyboard
  if (event.keyCode === 13) {
    submitButton.click();
  }
});
!
999px

Console