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Box Shadow Generator Javascript

Hey everyone. Welcome to today’s tutorial. In today’s tutorial, we will create a box-shadow generator. To build this project we need HTML, CSS and Javascript. This project is quite simple and easy to understand. I would suggest this project for javascript beginners looking for projects to improve their javascript skills.
If you are looking for more complex tutorials, you can check out this playlist here. This playlist consists of more than 60+ javascript projects with varying levels of difficulty. All of these projects come along with free source code.

Video Tutorial:

If you prefer to learn by coding along to a video tutorial you should check out the video down below. Also subscribe to my youtube channel to stay updated with the latest tutorials, tips and tricks. I also post multiple-choice questions daily to help you learn HTML, CSS and Javascript.


Project Folder Structure:

We begin by creating the project folder structure. We create a project folder named – ‘Box Shadow Generator’. Inside this folder, we have three files – index.html, style.css and script.js. These are the HTML document, the stylesheet and the javascript file.


We start with HTML code. Firstly copy the code below and paste it into your HTML document.

In the HTML code, we have a bunch of range sliders with unique ids assigned to each of them. Also, they come with min, max and a default value.

<!DOCTYPE html>
<html lang="en">
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Box Shadow Generator</title>
    <!-- Google Font -->
    <!-- Stylesheet -->
    <link rel="stylesheet" href="style.css" />
    <div class="container">
      <div class="result">
        <div id="element"></div>
      <div class="sliders">
        <div class="slider-wrapper">
          <label for="h-shadow">Horizontal Shadow:</label>
          <input type="range" id="h-shadow" max="100" min="-100" value="0" />
        <div class="slider-wrapper">
          <label for="v-shadow">Vertical Shadow:</label>
          <input type="range" id="v-shadow" max="100" min="-100" value="0" />
        <div class="slider-wrapper">
          <label for="blur-radius">Blur Radius:</label>
          <input type="range" id="blur-radius" max="100" min="0" value="0" />
        <div class="slider-wrapper">
          <label for="spread-radius">Spread Radius:</label>
          <input type="range" id="spread-radius" max="50" min="-50" value="0" />
        <div class="slider-wrapper">
          <label for="shadow-color">Shadow Color:</label>
          <input type="color" id="shadow-color" />
        <div class="slider-wrapper">
          <label for="shadow-color-opacity">Shadow Color Opacity:</label>
        <div class="input-wrapper">
          <label for="shadow-inset">Inset Shadow:</label>
          <input type="checkbox" id="shadow-inset" />
      <div class="code-wrapper">
        <textarea rows="2" id="code"></textarea>
        <button onclick="copyCode()">Copy</button>
    <!-- Script -->
    <script src="script.js"></script>

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We now style this generator using CSS. Now copy the code below and paste it into your stylesheet.

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
body {
  background-color: #0075ff;
.container {
  background-color: #ffffff;
  padding: 30px;
  position: absolute;
  transform: translate(-50%, -50%);
  left: 50%;
  top: 50%;
  width: 80vmin;
  border-radius: 10px;
  box-shadow: 0 20px 40px rgba(2, 42, 83, 0.2);
.result {
  padding: 150px 0;
#element {
  height: 50px;
  width: 50px;
  position: relative;
  background-color: #0075ff;
  margin: auto;
.sliders {
  display: grid;
  grid-template-columns: 6fr 6fr;
  gap: 20px 15px;
.slider-wrapper {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
input[type="range"] {
  width: 100%;
.code-wrapper {
  display: grid;
  grid-template-columns: 10fr 2fr;
  gap: 5px;
  margin-top: 20px;
textarea {
  resize: none;
  padding: 5px;
  border: 1px solid black;
  border-radius: 5px;
.code-wrapper button {
  background-color: #0075ff;
  border-radius: 5px;
  border: none;
  color: #ffffff;


We finally need to add functionality to this generator. To implement the logic we use Javascript. Once again copy the code below and paste it into your javascript file.

let elem = document.getElementById("element");
let code = document.getElementById("code");
let inputs = document.querySelectorAll(".sliders input");

inputs.forEach((inp) => inp.addEventListener("input", generateShadow));

function generateShadow() {
  let hShadow = document.getElementById("h-shadow").value;
  let vShadow = document.getElementById("v-shadow").value;
  let blurRadius = document.getElementById("blur-radius").value;
  let spreadRadius = document.getElementById("spread-radius").value;
  let shadowColor = document.getElementById("shadow-color").value;
  let shadowColorOpacity = document.getElementById(
  let shadowInset = document.getElementById("shadow-inset").checked;

  //Using ternary operator to check if inset checkbox is checked or not.
  //If checked we add the inset prefix
  //Else no inset prefix is added
  let boxShadow = shadowInset
    ? `inset ${hShadow}px ${vShadow}px ${blurRadius}px ${spreadRadius}px ${hexToRgba(
    : `${hShadow}px ${vShadow}px ${blurRadius}px ${spreadRadius}px ${hexToRgba(
  elem.style.boxShadow = boxShadow;
  code.textContent = `box-shadow: ${boxShadow};`;

//Converting Hex value to rgba
function hexToRgba(shadowColor, shadowColorOpacity) {
  let r = parseInt(shadowColor.substr(1, 2), 16);
  let g = parseInt(shadowColor.substr(3, 2), 16);
  let b = parseInt(shadowColor.substr(5, 2), 16);
  return `rgba(${r},${g},${b},${shadowColorOpacity})`;

//Copy the generated code to clipboard
function copyCode() {
  alert("Code Copied To Clipboard");

//Call the generateShadow function on every page load
window.onload = generateShadow();

Our box-shadow generator project is now ready. If you have any issues while creating this code you can download the source code by clicking on the download button below. Also, I would love to hear from you guys. So if you have any queries, suggestions or feedback please comment on them below.
Happy Coding.

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