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HTML

              
                <body>
	<div class="tree-container">
		<div class="snow-container"></div>
		<div class="topper">⭐</div>
		<svg width="452px" height="520px" viewBox="0 0 452 520" class="main-tree">
		    <defs>
		        <rect id="path-1" x="196" y="449" width="60" height="72"></rect>
		        <filter x="-16.7%" y="-13.9%" width="133.3%" height="127.8%" filterUnits="objectBoundingBox" id="filter-2">
		            <feGaussianBlur stdDeviation="5" in="SourceAlpha" result="shadowBlurInner1"></feGaussianBlur>
		            <feOffset dx="10" dy="0" in="shadowBlurInner1" result="shadowOffsetInner1"></feOffset>
		            <feComposite in="shadowOffsetInner1" in2="SourceAlpha" operator="arithmetic" k2="-1" k3="1" result="shadowInnerInner1"></feComposite>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowInnerInner1"></feColorMatrix>
		        </filter>
		        <polygon id="path-3" points="226 239 436 449 16 449"></polygon>
		        <filter x="-8.3%" y="-11.9%" width="116.7%" height="133.3%" filterUnits="objectBoundingBox" id="filter-4">
		            <feOffset dx="0" dy="10" in="SourceAlpha" result="shadowOffsetOuter1"></feOffset>
		            <feGaussianBlur stdDeviation="10" in="shadowOffsetOuter1" result="shadowBlurOuter1"></feGaussianBlur>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowBlurOuter1"></feColorMatrix>
		        </filter>
		        <polygon id="path-5" points="226 149 406 329 46 329"></polygon>
		        <filter x="-9.7%" y="-13.9%" width="119.4%" height="138.9%" filterUnits="objectBoundingBox" id="filter-6">
		            <feOffset dx="0" dy="10" in="SourceAlpha" result="shadowOffsetOuter1"></feOffset>
		            <feGaussianBlur stdDeviation="10" in="shadowOffsetOuter1" result="shadowBlurOuter1"></feGaussianBlur>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowBlurOuter1"></feColorMatrix>
		        </filter>
		        <polygon id="path-7" points="226 74 376 224 76 224"></polygon>
		        <filter x="-11.7%" y="-16.7%" width="123.3%" height="146.7%" filterUnits="objectBoundingBox" id="filter-8">
		            <feOffset dx="0" dy="10" in="SourceAlpha" result="shadowOffsetOuter1"></feOffset>
		            <feGaussianBlur stdDeviation="10" in="shadowOffsetOuter1" result="shadowBlurOuter1"></feGaussianBlur>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowBlurOuter1"></feColorMatrix>
		        </filter>
		        <polygon id="path-9" points="226 14 346 134 106 134"></polygon>
		        <filter x="-14.6%" y="-20.8%" width="129.2%" height="158.3%" filterUnits="objectBoundingBox" id="filter-10">
		            <feOffset dx="0" dy="10" in="SourceAlpha" result="shadowOffsetOuter1"></feOffset>
		            <feGaussianBlur stdDeviation="10" in="shadowOffsetOuter1" result="shadowBlurOuter1"></feGaussianBlur>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowBlurOuter1"></feColorMatrix>
		        </filter>
		        <circle id="path-11" cx="74" cy="240" r="16"></circle>
		        <filter x="-10.9%" y="-10.9%" width="121.9%" height="121.9%" filterUnits="objectBoundingBox" id="filter-12">
		            <feGaussianBlur stdDeviation="2.5" in="SourceAlpha" result="shadowBlurInner1"></feGaussianBlur>
		            <feOffset dx="2" dy="-2" in="shadowBlurInner1" result="shadowOffsetInner1"></feOffset>
		            <feComposite in="shadowOffsetInner1" in2="SourceAlpha" operator="arithmetic" k2="-1" k3="1" result="shadowInnerInner1"></feComposite>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowInnerInner1"></feColorMatrix>
		        </filter>
		        <circle id="path-13" cx="106" cy="150" r="16"></circle>
		        <filter x="-10.9%" y="-10.9%" width="121.9%" height="121.9%" filterUnits="objectBoundingBox" id="filter-14">
		            <feGaussianBlur stdDeviation="2.5" in="SourceAlpha" result="shadowBlurInner1"></feGaussianBlur>
		            <feOffset dx="2" dy="-2" in="shadowBlurInner1" result="shadowOffsetInner1"></feOffset>
		            <feComposite in="shadowOffsetInner1" in2="SourceAlpha" operator="arithmetic" k2="-1" k3="1" result="shadowInnerInner1"></feComposite>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowInnerInner1"></feColorMatrix>
		        </filter>
		        <circle id="path-15" cx="344" cy="150" r="16"></circle>
		        <filter x="-10.9%" y="-10.9%" width="121.9%" height="121.9%" filterUnits="objectBoundingBox" id="filter-16">
		            <feGaussianBlur stdDeviation="2.5" in="SourceAlpha" result="shadowBlurInner1"></feGaussianBlur>
		            <feOffset dx="2" dy="-2" in="shadowBlurInner1" result="shadowOffsetInner1"></feOffset>
		            <feComposite in="shadowOffsetInner1" in2="SourceAlpha" operator="arithmetic" k2="-1" k3="1" result="shadowInnerInner1"></feComposite>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowInnerInner1"></feColorMatrix>
		        </filter>
		        <circle id="path-17" cx="376" cy="240" r="16"></circle>
		        <filter x="-10.9%" y="-10.9%" width="121.9%" height="121.9%" filterUnits="objectBoundingBox" id="filter-18">
		            <feGaussianBlur stdDeviation="2.5" in="SourceAlpha" result="shadowBlurInner1"></feGaussianBlur>
		            <feOffset dx="2" dy="-2" in="shadowBlurInner1" result="shadowOffsetInner1"></feOffset>
		            <feComposite in="shadowOffsetInner1" in2="SourceAlpha" operator="arithmetic" k2="-1" k3="1" result="shadowInnerInner1"></feComposite>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowInnerInner1"></feColorMatrix>
		        </filter>
		        <circle id="path-19" cx="46" cy="345" r="16"></circle>
		        <filter x="-10.9%" y="-10.9%" width="121.9%" height="121.9%" filterUnits="objectBoundingBox" id="filter-20">
		            <feGaussianBlur stdDeviation="2.5" in="SourceAlpha" result="shadowBlurInner1"></feGaussianBlur>
		            <feOffset dx="2" dy="-2" in="shadowBlurInner1" result="shadowOffsetInner1"></feOffset>
		            <feComposite in="shadowOffsetInner1" in2="SourceAlpha" operator="arithmetic" k2="-1" k3="1" result="shadowInnerInner1"></feComposite>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowInnerInner1"></feColorMatrix>
		        </filter>
		        <circle id="path-21" cx="406" cy="345" r="16"></circle>
		        <filter x="-10.9%" y="-10.9%" width="121.9%" height="121.9%" filterUnits="objectBoundingBox" id="filter-22">
		            <feGaussianBlur stdDeviation="2.5" in="SourceAlpha" result="shadowBlurInner1"></feGaussianBlur>
		            <feOffset dx="2" dy="-2" in="shadowBlurInner1" result="shadowOffsetInner1"></feOffset>
		            <feComposite in="shadowOffsetInner1" in2="SourceAlpha" operator="arithmetic" k2="-1" k3="1" result="shadowInnerInner1"></feComposite>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowInnerInner1"></feColorMatrix>
		        </filter>
		        <circle id="path-23" cx="16" cy="465" r="16"></circle>
		        <filter x="-10.9%" y="-10.9%" width="121.9%" height="121.9%" filterUnits="objectBoundingBox" id="filter-24">
		            <feGaussianBlur stdDeviation="2.5" in="SourceAlpha" result="shadowBlurInner1"></feGaussianBlur>
		            <feOffset dx="2" dy="-2" in="shadowBlurInner1" result="shadowOffsetInner1"></feOffset>
		            <feComposite in="shadowOffsetInner1" in2="SourceAlpha" operator="arithmetic" k2="-1" k3="1" result="shadowInnerInner1"></feComposite>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowInnerInner1"></feColorMatrix>
		        </filter>
		        <circle id="path-25" cx="436" cy="465" r="16"></circle>
		        <filter x="-10.9%" y="-10.9%" width="121.9%" height="121.9%" filterUnits="objectBoundingBox" id="filter-26">
		            <feGaussianBlur stdDeviation="2.5" in="SourceAlpha" result="shadowBlurInner1"></feGaussianBlur>
		            <feOffset dx="2" dy="-2" in="shadowBlurInner1" result="shadowOffsetInner1"></feOffset>
		            <feComposite in="shadowOffsetInner1" in2="SourceAlpha" operator="arithmetic" k2="-1" k3="1" result="shadowInnerInner1"></feComposite>
		            <feColorMatrix values="0 0 0 0 0   0 0 0 0 0   0 0 0 0 0  0 0 0 0.5 0" type="matrix" in="shadowInnerInner1"></feColorMatrix>
		        </filter>
		    </defs>
		    <g id="Artboard" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
		        <g id="Rectangle">
		            <use fill="#8B572A" fill-rule="evenodd" xlink:href="#path-1"></use>
		            <use fill="black" fill-opacity="1" filter="url(#filter-2)" xlink:href="#path-1"></use>
		        </g>
		        <g id="Triangle">
		            <use fill="black" fill-opacity="1" filter="url(#filter-4)" xlink:href="#path-3"></use>
		            <use fill="#507E1A" fill-rule="evenodd" xlink:href="#path-3"></use>
		        </g>
		        <g id="Triangle">
		            <use fill="black" fill-opacity="1" filter="url(#filter-6)" xlink:href="#path-5"></use>
		            <use fill="#507E1A" fill-rule="evenodd" xlink:href="#path-5"></use>
		        </g>
		        <g id="Triangle">
		            <use fill="black" fill-opacity="1" filter="url(#filter-8)" xlink:href="#path-7"></use>
		            <use fill="#507E1A" fill-rule="evenodd" xlink:href="#path-7"></use>
		        </g>
		        <g id="Triangle">
		            <use fill="black" fill-opacity="1" filter="url(#filter-10)" xlink:href="#path-9"></use>
		            <use fill="#507E1A" fill-rule="evenodd" xlink:href="#path-9"></use>
		        </g>
		        <g id="Oval">
		            <use fill="var(--primary-colour)" fill-rule="evenodd" xlink:href="#path-13"></use>
		            <use fill="black" fill-opacity="1" filter="url(#filter-14)" xlink:href="#path-13"></use>
		        </g>
		        <g id="Oval">
		            <use fill="var(--secondary-colour)" fill-rule="evenodd" xlink:href="#path-15"></use>
		            <use fill="black" fill-opacity="1" filter="url(#filter-16)" xlink:href="#path-15"></use>
		        </g>
		        <g id="Oval">
		            <use fill="var(--secondary-colour)" fill-rule="evenodd" xlink:href="#path-11"></use>
		            <use fill="black" fill-opacity="1" filter="url(#filter-12)" xlink:href="#path-11"></use>
		        </g>
		        <g id="Oval">
		            <use fill="var(--primary-colour)" fill-rule="evenodd" xlink:href="#path-17"></use>
		            <use fill="black" fill-opacity="1" filter="url(#filter-18)" xlink:href="#path-17"></use>
		        </g>
		        <g id="Oval">
		            <use fill="var(--primary-colour)" fill-rule="evenodd" xlink:href="#path-19"></use>
		            <use fill="black" fill-opacity="1" filter="url(#filter-20)" xlink:href="#path-19"></use>
		        </g>
		        <g id="Oval">
		            <use fill="var(--secondary-colour)" fill-rule="evenodd" xlink:href="#path-21"></use>
		            <use fill="black" fill-opacity="1" filter="url(#filter-22)" xlink:href="#path-21"></use>
		        </g>
		        <g id="Oval">
		            <use fill="var(--secondary-colour)" fill-rule="evenodd" xlink:href="#path-23"></use>
		            <use fill="black" fill-opacity="1" filter="url(#filter-24)" xlink:href="#path-23"></use>
		        </g>
		        <g id="Oval">
		            <use fill="var(--primary-colour)" fill-rule="evenodd" xlink:href="#path-25"></use>
		            <use fill="black" fill-opacity="1" filter="url(#filter-26)" xlink:href="#path-25"></use>
		        </g>
		        <g id="lights-container">
		        </g>
		    </g>
		</svg>
		<div class="ground"></div>
		<div class="present-container"></div>
	</div>
	<div class="controls">
		<h3>Customise your tree!</h3>
		<div class="control">
			<select name="toppers" class="toppers">
				<option value="⭐">⭐</option>
				<option value="👼">👼</option>
			</select>
		</div>
		<div class="control">
			<button id="add-present">Add a present! 🎁</button>
		</div>
		<div class="control">
			<label for="primary-colour">Change primary bauble colour</label>
			<input class="colour-picker" type="color" name="primary-colour" value="#ff0000">
		</div>
		<div class="control">
			<label for="secondary-colour">Change secondary bauble colour</label>
			<input class="colour-picker" type="color" name="secondary-colour" value="#DAA520">
		</div>
		<div class="control">
			<label for="tinsel-colour">Change tinsel colour</label>
			<input class="colour-picker" type="color" name="tinsel-colour" value="#C0C0C0">
		</div>
		<div class="control">
			<p>Add a new decoration! Select one here, then click on the tree</p>
      <p>For tinsel, click the tree and drag across</p>
			<select name="decoration-select" class="decoration-select">
				<option value=""> </option>
				<option value="light">light</option>
				<option value="⛄">⛄</option>
				<option value="🎅🏼">🎅🏼</option>
				<option value="🌟">🌟</option>
				<option value="🎀">🎀</option>
				<option value="🕯️">🕯️</option>
				<option value="🔔">🔔</option>
				<option value="🎄">🎄</option>
				<option value="❄️">❄️</option>
				<option value="🎁">🎁</option>
				<option value="🦌">🦌</option>
				<option value="🛷">🛷</option>
				<option value="tinsel">tinsel</option>
			</select>
		</div>
			<div class="control">
				<button id="snow-button">Let it snow! ❄️</button>
				<button id="stop-button" class="hidden-button">Stop, it's too snowy 🌨️</button>
				<audio id="sleigh-bells" src="http://soundbible.com/1256-Sleigh-Bells-Ringing.mp3"></audio>
			</div>
			<div class="control">
				<button id="cat-button">🐈</button>
				<p id="cat-warning"></p>
			</div>
	</div>
	<div class="ground"></div>
</body>
              
            
!

CSS

              
                
:root {
	--primary-colour: #ff0000;
	--secondary-colour: #DAA520;
	--tinsel-colour: #C0C0C0;
}

body {
	display: flex;
	justify-content: space-between;
	background-color: #DCDCDC;
}

.ground {
	position: absolute;
	background-color: #FFF;
	width: 100%;
	height: 1000px;
	left: 0px;
	top: 600px;
	z-index: -10;
}

.controls {
	min-width: 300px;
	display: flex;
	flex-direction: column;
	padding: 10px;
	margin-right: 50px;
	text-align: center;
	font-family: 'Helvetica Neue', sans-serif;
	border: 1px solid grey;
	border-radius: 5px;
	background-color: #FFF;
	box-shadow: 3px 3px grey;
}

.control {
	margin-bottom: 2em;
}

select, button {
	font-size: 1.2em;
}

.sound-effect-box {
	border: 1px solid grey;
	border-radius: 5px;
	margin: 0 20px 20px;
}

.tree-container {
	margin-top: 50px;
}

.main-tree {
	padding: 0 50px;
}

#Triangle {
	cursor: pointer;
}

.topper {
  width: 100%;
  height: 50px;
  margin-bottom: -24px;
  text-align: center;
  font-size: 2.4em;
}

.present-container {
	font-size: 3em;
	text-align: center;
	line-height: 0.6em;
	width: 452px;
	padding: 0 50px;
	margin-top: -20px;
}

.decoration {
	position: absolute;
	font-size: 30px;
	z-index: 100;
}

.tinsel {
	stroke: var(--tinsel-colour);
	stroke-width: 18;
	fill: none;
	stroke-linecap: round;
	stroke-linejoin: round;
}

.snowflake {
	width: 7px;
	height: 7px;
	background-color: #fff;
	border-radius: 50%;
	border-bottom: 1px solid lightgrey;
	position: absolute;
	z-index: 200;
}

.hidden-button {
	display: none;
}
              
            
!

JS

              
                const topSelector = document.querySelector('.toppers');
		const topper = document.querySelector('.topper');
		function changeTopper() {
			topper.textContent = topSelector.value;
		}
		topSelector.addEventListener('change', changeTopper);

		const addButton = document.getElementById('add-present');
		const presents = document.querySelector('.present-container');
		function addPresent() {
			if (presents.textContent.length < 34) {
				presents.textContent += "🎁";
			}
		}
		addButton.addEventListener('click', addPresent);

		const colourPickers = document.querySelectorAll('.colour-picker');
		function changeColour() {
			document.documentElement.style.setProperty(`--${this.name}`, this.value);
		}
		colourPickers.forEach(picker => picker.addEventListener('change', changeColour));

const decSelector = document.querySelector('.decoration-select');
		const tree = document.querySelector('.tree-container');
		const triangles = document.querySelectorAll('#Triangle');
		let lightsContainer = document.getElementById('lights-container');
		function placeDecoration(e) {
			if (decSelector.value !== "" && decSelector.value !== "tinsel") {
				if (decSelector.value === "light") {			
					const light = document.createElementNS("http://www.w3.org/2000/svg", 'circle');
					light.setAttribute("fill", "#FFFF00");
					light.setAttribute("cy", `${e.offsetY}`);
					light.setAttribute("cx", `${e.offsetX - 50}`);
					light.setAttribute("r", "1");
					lightsContainer.appendChild(light);
				} else {
					const decoration = document.createElement('div');
					decoration.textContent = decSelector.value;
					decoration.classList.add('decoration');
					decoration.style.top = `${e.offsetY + 70}px`;
					decoration.style.left = `${e.offsetX - 5}px`;
					tree.appendChild(decoration);
				}
			}
		}
		triangles.forEach(triangle => triangle.addEventListener('click', placeDecoration));

		let startX = 0;
		let startY = 0;
		const mainTree = document.querySelector(".main-tree");
		function startTinsel(e) {
			if (decSelector.value === "tinsel") {
				startX = e.offsetX - 50;
				startY = e.offsetY;
			}
		}
		function endTinsel(e) {
			if (decSelector.value === "tinsel") {
				const tinsel = document.createElementNS("http://www.w3.org/2000/svg", 'path');
				let endX = e.offsetX - 50;
				let endY = e.offsetY;
				tinsel.classList.add("tinsel");
				tinsel.setAttribute("d", `M ${startX},${startY} C ${startX},${startY+18} ${endX},${endY+18} ${endX},${endY} `);
				mainTree.appendChild(tinsel);
			}
		}
		triangles.forEach(triangle => triangle.addEventListener('mousedown', startTinsel));
		triangles.forEach(triangle => triangle.addEventListener('mouseup', endTinsel));

		function twinkle() {
			if (lightsContainer.hasChildNodes()) {
				lightsContainer.querySelectorAll('circle').forEach(light => {
					light.setAttribute('r', `${Math.random()+1}`);
				});
			}
		}
		setInterval(twinkle, 500);
		twinkle();

		const snowButton = document.getElementById('snow-button');
		const stopButton = document.getElementById('stop-button');
		const snowContainer = document.querySelector('.snow-container');
		const sleighBellsSound = document.getElementById('sleigh-bells');
		let snowing = null;

		function letItSnow() {
			stopButton.classList.remove("hidden-button");
			snowButton.classList.add("hidden-button");
			function createFlake() {
				let flake = document.createElement('div');
				flake.classList.add('snowflake');
				flake.style.top = '0px';
				flake.style.left = `${Math.random() * window.innerWidth}px`;
				snowContainer.appendChild(flake);
				function snowfall() {
					let topValue = parseInt(flake.style.top.slice(0, flake.style.top.length-2), 10);
					if (topValue < 650) {
						flake.style.top = `${topValue + 1}px`;
					} else {
						flake.remove();
					}
				}
				setInterval(snowfall, (Math.random() * 100) + 10);
				snowfall();
			}

			snowing = setInterval(createFlake, 2000);
		}

		function stopSnow() {
			snowButton.classList.remove("hidden-button");
			stopButton.classList.add("hidden-button");
			clearInterval(snowing);
		}
		snowButton.addEventListener('click', letItSnow);
		stopButton.addEventListener('click', stopSnow);

		const catButton = document.getElementById("cat-button");
		const catSound = document.getElementById("cat-meow");
		const catWarning = document.getElementById("cat-warning");
		function dropDecs() {
			if (!document.querySelectorAll(".decoration").length) {
				catWarning.textContent = "Add some decorations first!";
			} else {
				catWarning.textContent = "";
				Array.from(document.querySelectorAll(".decoration")).filter((dec, index) => index % 2 === 1).forEach(decoration => {
					decoration.style.top = `${(Math.random()*30)+610}px`;
					decoration.style.transform = `rotate(${(Math.random()*180)-90}deg)`;
				});
			}
		}
		catButton.addEventListener('click', dropDecs);
              
            
!
999px

Console