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CSS

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HTML 

              
                <form>
	<h1>Customize Your Pizza</h1>
	<div class="form-columns">
		<div class="form-column">
			<h2>Size</h2>
			<label>
				<input class="pristine" type="radio" name="size" value="small"> <span>Small <small>(10.00)</small></span>
			</label>
			<label>
				<input class="pristine" type="radio" name="size" value="medium"> <span>Medium <small>(15.00)</small></span>
			</label>
			<label>
				<input class="pristine" type="radio" name="size" value="large"> <span>Large <small>(20.00)</small></span>
			</label>
		</div>
		<div class="form-column">
			<h2>Toppings</h2>
			<label>
				<input class="pristine" type="checkbox" name="toppings" value="ham"> <span>Ham <small>(0.50)</small></span>
			</label>
			<label>
				<input class="pristine" type="checkbox" name="toppings" value="pepperoni"> <span>Pepperoni <small>(0.50)</small></span>
			</label>
			<label>
				<input class="pristine" type="checkbox" name="toppings" value="bacon"> <span>Bacon <small>(0.50)</small></span>
			</label>
		</div>
	</div>
	<div class="screen">
		<span class="screen-value">0.00</span>
	</div>
	<button type="reset">
		<span tabindex="-1">Order</span>
	</button>
</form>
!

CSS 

              
                * {
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
:root {
	--animDur: 0.3s;
	--transDur: 0.1s;
	--buttonTiming: linear;
	--checkboxTiming: linear;
	--radioTiming: linear;
	font-size: calc(16px + (24 - 16) * (100vw - 320px) / (1280 - 320));
}
body, button, input {
	font: 1em/1.5 "Manjari", sans-serif;
}
body, label {
	display: flex;
}
body {
	background-color: #f48d25;
	color: #17181c;
	height: 100vh;
}
form {
	background-color: #e3e4e8;
	background-image:
		linear-gradient(180deg,#0000,#0001),
		radial-gradient(0.5em 0.5em at 0.75em 0.75em,#fff 25%,#fff0 50%),
		radial-gradient(95% 0.75em at 50% 0.75em,#fff 25%,#fff0 50%);
	border-radius: 1.5em;
	box-shadow:
		0 0.5em 0.5em #fff4 inset,
		0 -0.25em 0.5em 0.25em #0007 inset,
		0 0.5em 1.5em #0007;
	margin: auto;
	max-width: 24.5em;
	padding: 1.5em;
	width: calc(100% - 3em);
}
button, h2, label {
	margin-bottom: 0.75em;
}
button, label {
	-webkit-tap-highlight-color: transparent;
}
button, .screen {
	margin-left: auto;
	margin-right: auto;
}
h1, h2, input + span {
	text-shadow: 0 0 0.25em #0004;
}
h1, .screen {
	font-size: 1.5em;
	line-height: 1;
}
h1 {
	margin-bottom: 0.75rem;
	padding-top: 0.75rem;
	text-align: center;
}
h2 {
	font-size: 1em;
}
label {
	align-items: center;
	flex-wrap: wrap;
	position: relative;
}
small {
	font-size: 0.75em;
	vertical-align: middle;
}
.form-columns {
	display: grid;
	grid-gap: 1.5em;
	grid-template-columns: repeat(auto-fit,minmax(10em,1fr));
	margin-bottom: 1.5em;
}
.screen {
	background-image: linear-gradient(180deg,#9aa38f,#8d9781);
	border-radius: 0.25rem;
	box-shadow:
		0 -0.25rem 0.25rem #0004,
		0 0.25rem 0.25rem #fff4,
		0 0.25rem 0.25rem #0007 inset;
	font-family: "VT323", monospace;
	margin-bottom: 2rem;
	padding: 0.5rem 0.75rem;
	max-width: 6.5rem;
}
.screen-value {
	display: inline-block;
	text-align: right;
	text-shadow: 0.1rem 0.1rem 0.1rem #0004;
	text-transform: uppercase;
	width: 100%;
}
.fade-in {
	animation: valueFadeIn 0.05s linear;
}
/* All */
button:focus, button span:focus, input:focus {
	outline: transparent;
}
input:focus + span {
	color: #db0b0b;
	text-shadow: 0 0 0.25em #db0b0b44;
}
button, input[type=checkbox], input[type=radio], label {
	cursor: pointer;
}
input[type=checkbox], input[type=checkbox]:before, input[type=checkbox]:after, 
input[type=radio], input[type=radio]:before, input[type=radio]:after {
	width: 2.25rem;
}
button, input[type=checkbox], input[type=checkbox]:before, 
input[type=radio], input[type=radio]:before, input[type=radio]:after {
	height: 2.25rem;
}
input[type=checkbox], input[type=radio] {
	margin-right: 0.75em;
	-webkit-appearance: none;
	appearance: none;
}
input[type=checkbox]:before, input[type=checkbox]:after, 
input[type=radio]:before, input[type=radio]:after {
	display: block;
	position: absolute;
	top: 0;
	left: 0;
}
input[type=checkbox]:before, 
input[type=radio]:before, input[type=radio]:after {
	content: "";
}
/* Buttons */
button {
	background-color: #db0b0b;
	background-image:
		linear-gradient(180deg,#0000,#0002),
		radial-gradient(90% 7% at 50% 8%,#fff7 25%,#fff0 50%);
	box-shadow:
		0.25em 0.25em 0.5em #0007,
		0 -0.1em 0 0.1em #0004,
		0 0.1em 0 0.1em #fff4,
		-0.25rem 0 0.25rem #aa0909 inset,
		0 0.25rem 0.25rem #fff4 inset,
		0.25rem 0 0.25rem #fff4 inset,
		0 -0.25rem 0.25rem #aa0909 inset;
	border-radius: 1.125em;
	color: #fff;
	display: block;
	text-shadow: 0 0 0.25em #fff7;
	transition: box-shadow var(--transDur) var(--buttonTiming);
	max-width: 14rem;
	width: 100%;
}
button span {
	display: block;
	padding: 0.5em;
	transition: transform var(--transDur) var(--buttonTiming);
}
button:active {
	box-shadow:
		0 0 0 #0007,
		0 -0.1em 0 0.1em #0004,
		0 0.1em 0 0.1em #fff4,
		-0.25rem 0 0.25rem #7a0606 inset,
		0 0.25rem 0.25rem #0004 inset,
		0.25rem 0 0.25rem #0004 inset,
		0 -0.25rem 0.25rem #7a0606 inset;
}
button:active span {
	transform: scale(0.95);
}
button:focus {
	color: #fbb7b7;
	text-shadow: 0 0 0.25em #fbb7b777;
}
/* Checkboxes */
input[type=checkbox] {
	animation: checkboxFlipFalse var(--animDur) var(--checkboxTiming);
	box-shadow:
		0.25em 0.25em 0.5em #0007,
		0 -0.1em 0 0.1em #0004,
		0 0.75em 0.5em 0.25em #0003 inset,
		0 0.1em 0 0.1em #fff4;
}
input[type=checkbox]:checked {
	animation: checkboxFlipTrue var(--animDur) var(--checkboxTiming);
}
input[type=checkbox]:before, input[type=checkbox]:after {
	background-color: #db0b0b;
}
input[type=checkbox]:before {
	animation: checkboxFlipFalseBefore var(--animDur) var(--checkboxTiming);
	background-image:
		linear-gradient(180deg,#0000,#0002),
		radial-gradient(7% 7% at 8% 8%,#fff7 37.5%,#fff0 50%),
		radial-gradient(90% 7% at 50% 8%,#fff7 25%,#fff0 50%);
	box-shadow:
		-0.25rem 0 0.25rem #920707 inset,
		0 0.25rem 0.25rem #fff4 inset,
		0.25rem 0 0.25rem #fff4 inset,
		0 -0.25rem 0.25rem #920707 inset;
	color: #0000;
	content: "\2713";
	font-size: 2.25em;
	text-align: center;
	text-shadow: 0 0 0.25rem #0000;
	transform: translateZ(0.5rem);
}
input[type=checkbox]:checked:before {
	animation: checkboxFlipTrueBefore var(--animDur) var(--checkboxTiming);
	color: #fff;
	text-shadow: 0 0 0.25rem #fffa;
}
input[type=checkbox]:after {
	animation: checkboxFlipFalseAfter var(--animDur) var(--checkboxTiming);
	box-shadow:
		0.25rem 0 0.25rem #fff3 inset,
		0 0.25rem 0.25rem #aa0909 inset,
		-0.25rem 0 0.25rem #aa0909 inset;
	content: "";
	height: 1rem;
	transform: translateY(1rem) rotateX(-90deg) translateZ(1.5rem);
}
input[type=checkbox]:checked:after {
	animation: checkboxFlipTrueAfter var(--animDur) var(--checkboxTiming);
}
/* Radios */
input[type=radio], input[type=radio]:before, input[type=radio]:after {
	border-radius: 50%;
}
input[type=radio] {
	box-shadow:
		0.25em 0.25em 0.5em #0007,
		0 -0.1em 0 0.1em #0004,
		0 0.1em 0 0.1em #fff4,
		0 0 1.5em #0004 inset;
	transition: box-shadow var(--animDur) var(--radioTiming);
}
input[type=radio]:checked {
	box-shadow:
		0.25em 0.25em 1em #0000,
		0 -0.1em 0 0.1em #0004,
		0 0.1em 0 0.1em #fff7,
		0 0 1.5em #0004 inset;
}
input[type=radio]:before, input[type=radio]:after {
	backface-visibility: hidden;
	-webkit-backface-visibility: hidden;
}
input[type=radio]:before {
	animation: radioFlipFalseBefore var(--animDur) var(--radioTiming);
	background:
		linear-gradient(#0000 25%,#0004 75%),
		radial-gradient(50% 100% at 15% 50%,#aa0909 8%,#aa090900 24%),
		radial-gradient(50% 100% at 85% 50%,#aa0909 8%,#aa090900 24%),
		radial-gradient(100% 100% at center,#e90b0b00 41%,#e90b0b 46%),
		radial-gradient(100% 100% at center,#c20a0a00 36%,#c20a0a 38%),
		radial-gradient(100% 100% at 22% 38%,#fff4 6%,#fff0 12%),
		radial-gradient(100% 100% at 35% 25%,#fff4,#fff0 13%),
		radial-gradient(120% 100% at 50% 20%,#fff2,#fff0 13%),
		radial-gradient(100% 100% at 40% 40%,#fff4 4%,#fff0 12%),
		radial-gradient(100% 100% at 65% 20%,#fff4 4%,#fff0 12%),
		radial-gradient(100% 100% at 75% 33%,#fff4 6%,#fff0 12%),
		radial-gradient(100% 100% at center,#ee0c0c 13%,#db0b0b 25% 49%,#db0b0b00 50%);
	background-position: 0 0;
	background-repeat: no-repeat;
	background-size: 2.25em 2.25em;
}
input[type=radio]:checked:before {
	animation: radioFlipTrueBefore var(--animDur) var(--radioTiming);
	border-radius: 50% 50% 50% 50% / 100% 100% 0% 0%;
	height: 1.125em;
}
input[type=radio]:after {
	animation: radioFlipFalseAfter var(--animDur) var(--radioTiming);
	background-color: #fff;
	background-image:
		radial-gradient(2.25rem 2.25rem at 1.125rem 1.175rem,#fff0 0.905rem,#fff1 0.925rem),
		radial-gradient(2.25rem 2.25rem at 1.125rem 1.075rem,#0000 0.905rem,#0003 0.925rem),
		radial-gradient(2.25rem 2.25rem at center,#db0b0b00 0.605rem,#db0b0b 0.625rem),
		radial-gradient(2.25rem 2.25rem at 1.125rem 1.225rem,#0000 0.555rem,#0003 0.575rem),
		radial-gradient(2.25rem 2.25rem at 1.125rem 1.025rem,#fff0 0.555rem,#fff3 0.575rem),
		radial-gradient(2.25rem 2.25rem at center,#db0b0b00 0.455rem,#db0b0b 0.475rem),
		radial-gradient(2.25rem 2.25rem at 1.325rem 1.325rem,#0000 0.475rem,#0003 0.675rem);
	filter: brightness(0.1);
	-webkit-filter: brightness(0.1);
	transform: rotateX(-180deg);
}
input[type=radio]:checked:after {
	animation: radioFlipTrueAfter var(--animDur) var(--radioTiming);
	filter: brightness(1);
	-webkit-filter: brightness(1);
	transform: rotateX(0);
}
input[type=checkbox].pristine,
input[type=checkbox].pristine:before, input[type=checkbox].pristine:after,
input[type=radio].pristine:before, input[type=radio].pristine:after {
	animation-name: none;
}
/* Animations */
@keyframes checkboxFlipTrue {
	from, to {
		box-shadow:
			0.25em 0.25em 0.5em #0007,
			0 -0.1em 0 0.1em #0004,
			0 0.75em 0.5em 0.25em #0003 inset,
			0 0.1em 0 0.1em #fff4;
	}
	50% {
		box-shadow:
			0.25em 0.25em 1em #0000,
			0 -0.1em 0 0.1em #0004,
			0 0.75em 0.5em 0.25em #0003 inset,
			0 0.1em 0 0.1em #fff4;
	}
}
@keyframes checkboxFlipFalse {
	from, to {
		box-shadow:
			0.25em 0.25em 0.5em #0007,
			0 -0.1em 0 0.1em #0004,
			0 0.75em 0.5em 0.25em #0003 inset,
			0 0.1em 0 0.1em #fff4;
	}
	50% {
		box-shadow:
			0.25em 0.25em 1em #0000,
			0 -0.1em 0 0.1em #0004,
			0 0.75em 0.5em 0.25em #0003 inset,
			0 0.1em 0 0.1em #fff4;
	}
}
@keyframes checkboxFlipTrueBefore {
	from {
		color: #0000;
		filter: brightness(1);
		-webkit-filter: brightness(1);
		text-shadow: 0 0 0.25rem #0000;
		transform: rotateX(0deg) translateZ(0.5rem);
	}
	50% {
		color: #0000;
		filter: brightness(0.55);
		-webkit-filter: brightness(0.55);
		text-shadow: 0 0 0.25rem #0000;
		transform: rotateX(90deg) translateZ(0.5rem);
	}
	50.1% {
		color: #fff;
		filter: brightness(0.55);
		-webkit-filter: brightness(0.55);
		text-shadow: 0 0 0.25rem #fffa;
		transform: rotateX(-90deg) translateZ(0.5rem);
	}
	to {
		color: #fff;
		filter: brightness(1);
		-webkit-filter: brightness(1);
		text-shadow: 0 0 0.25rem #fffa;
		transform: rotateX(0deg) translateZ(0.5rem);
	}
}
@keyframes checkboxFlipFalseBefore {
	from {
		color: #fff;
		filter: brightness(1);
		-webkit-filter: brightness(1);
		text-shadow: 0 0 0.25rem #fffa;
		transform: rotateX(0deg) translateZ(0.5rem);
	}
	50% {
		color: #fff;
		filter: brightness(0.55);
		-webkit-filter: brightness(0.55);
		text-shadow: 0 0 0.25rem #fffa;
		transform: rotateX(90deg) translateZ(0.5rem);
	}
	50.1% {
		color: #0000;
		filter: brightness(0.55);
		-webkit-filter: brightness(0.55);
		text-shadow: 0 0 0.25rem #0000;
		transform: rotateX(-90deg) translateZ(0.5rem);
	}
	to {
		color: #0000;
		filter: brightness(1);
		-webkit-filter: brightness(1);
		text-shadow: 0 0 0.25rem #0000;
		transform: rotateX(0deg) translateZ(0.5rem);
	}
}
@keyframes checkboxFlipTrueAfter {
	from {
		filter: brightness(0.775);
		-webkit-filter: brightness(0.775);
		transform: translateY(0.625rem) rotateX(-90deg) translateZ(1.125rem);
	}
	50% {
		filter: brightness(1);
		-webkit-filter: brightness(1);
		transform: translateY(0.625rem) rotateX(0deg) translateZ(1.125rem);
	}
	to {
		filter: brightness(0.775);
		-webkit-filter: brightness(0.775);
		transform: translateY(0.625rem) rotateX(90deg) translateZ(1.125rem);
	}
}
@keyframes checkboxFlipFalseAfter {
	from {
		filter: brightness(0.775);
		-webkit-filter: brightness(0.775);
		transform: translateY(0.625rem) rotateX(-90deg) translateZ(1.125rem);
	}
	50% {
		filter: brightness(1);
		-webkit-filter: brightness(1);
		transform: translateY(0.625rem) rotateX(0deg) translateZ(1.125rem);
	}
	to {
		filter: brightness(0.775);
		-webkit-filter: brightness(0.775);
		transform: translateY(0.625rem) rotateX(90deg) translateZ(1.125rem);
	}
}
@keyframes radioFlipTrueBefore {
	from {
		border-radius: 50%;
		height: 2.25rem;
	}
	50%, to {
		border-radius: 50% 50% 50% 50% / 100% 100% 0% 0%;
		height: 1.125rem;
	}
}
@keyframes radioFlipFalseBefore {
	from, 50% {
		background-position: 0 100%;
		border-radius: 50% 50% 50% 50% / 0% 0% 100% 100%;
		height: 1.125rem;
		transform: translateY(1.125rem);
	}
	to {
		background-position: 0 100%;
		border-radius: 50%;
		height: 2.25rem;
		transform: translateY(0);
	}
}
@keyframes radioFlipTrueAfter {
	from {
		filter: brightness(0.1);
		-webkit-filter: brightness(0.1);
		transform: rotateX(-180deg);
	}
	to {
		filter: brightness(1);
		-webkit-filter: brightness(1);
		transform: rotateX(0);
	}
}
@keyframes radioFlipFalseAfter {
	from {
		filter: brightness(1);
		-webkit-filter: brightness(1);
		transform: rotateX(0);
	}
	to {
		filter: brightness(0.1);
		-webkit-filter: brightness(0.1);
		transform: rotateX(180deg);
	}
}
@keyframes valueFadeIn {
	from {
		opacity: 0;
	}
	to {
		opacity: 1;
	}
}
!

JS 

              
                document.addEventListener("DOMContentLoaded",() => {
	let toyForm = new ToyForm();
});

class ToyForm {
	constructor() {
		let form = document.forms[0];

		this.screen = form.querySelector(".screen-value");

		form.addEventListener("change",this.calcPrice.bind(this));
		form.addEventListener("reset",this.updatePrice.bind(this,0));
		form.reset();
	}
	calcPrice(e) {
		let inputs = document.querySelectorAll("[name='size'],[name='toppings']"),
			items = [
				{
					name: "small",
					price: 10
				},
				{
					name: "medium",
					price: 15
				},
				{
					name: "large",
					price: 20
				},
				{
					name: "ham",
					price: 0.5
				},
				{
					name: "pepperoni",
					price: 0.5
				},
				{
					name: "bacon",
					price: 0.5
				}
			],
			totalPrice = 0;

		// remove the target’s `pristine` class, which prevents the CSS animation on load
		if (e && e.target.classList.contains("pristine"))
			e.target.removeAttribute("class");

		// calculate the price
		inputs.forEach(i => {
			if (i.checked) {
				let selectedItem = items.find(I => I.name == i.value);

				if (selectedItem)
					totalPrice += selectedItem.price;
			}
		});
		this.updatePrice(totalPrice);
	}
	updatePrice(value) {
		let fadeInClass = "fade-in",
			screenCL = this.screen.classList;

		this.screen.textContent = value < 1e5 ? value.toFixed(2) : "Overflow";

		// replay CSS animation
		screenCL.remove(fadeInClass);
		void this.screen.offsetWidth;
		setTimeout(() => {
			screenCL.add(fadeInClass);
		},0);
	}
}
!
999px

Console