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HTML 

              
                //- https://www.frontendmentor.io/challenges/pricing-component-with-toggle-8vPwRMIC
main#main.p-pricing.max-width-4.p2.mx-auto
	.p-pricing__header.center
		h1.h1.bold.mb3.mt4#btn-label Our Pricing
		.p-btn.flex.justify-center.items-center.gray-blue
			span.pr2#anually Annually
			span
				button(aria-describedby="monthly" aria-labelledby="btn-label").btn.btn-toggle.js-toggle#js-btn-price
					.btn-toggle__inner
			span.pl2#monthly Monthly
	.p-pricing__cards.mt4.sm-flex.justify-center.flex-wrap.flex-row.items-center.mb4
		.p-pricing__cards__card.box-shadow-1.p2.bg-white.rounded-12.center.mb2.mx-auto
			h2.bold.p1 Basic
			h3.h00.bold.p-money.mt2.flex.items-center.justify-center
				span.h1 $
				span#basic 19.99
			ul.my2.bold
				li.py2 500 GB Storage
				li.py2 2 Users Allowed
				li.py2 Send up to 3 GB
			.clearfix
				button.btn.btn-primary.caps.bold.h6.col.col-12 Learn more
		.p-pricing__cards__card.box-shadow-1.px2.py3.bg-white.rounded-12.center.bg-blue.white.mb2.mx-auto
			h2.bold.p1 Professional
			h3.h00.bold.p-money.mt2.flex.items-center.justify-center
				span.h1 $
				span#pro 24.99
			ul.my2.bold
				li.py2 1 TB Storage
				li.py2 5 Users Allowed
				li.py2 Send up to 10 GB
			.clearfix
				button.btn.btn-secondary.caps.bold.h6.col.col-12 Learn more
		.p-pricing__cards__card.box-shadow-1.p2.bg-white.rounded-12.center.mb2.mx-auto
			h2.bold.p1 Master
			h3.h00.bold.p-money.mt2.flex.items-center.justify-center
				span.h1 $
				span#master 39.99
			ul.my2.bold
				li.py2 2 TB Storage
				li.py2 10 Users Allowed
				li.py2 Send up to 20 GB
			.clearfix
				button.btn.btn-primary.caps.bold.h6.col.col-12 Learn more
!

CSS 

              
                html {
	font-size: 100%;
}

html, body {
	width: 100%;
	height: 100%;
	overflow-x: hidden;
}

$blue : lighten(blue, 20%);
$blue-light: lighten(blue, 35%);
$gray-blue: lighten(slategray, 5%);
$grayish: lighten(blue, 47%);

body {
	font-family: "Heebo", sans-serif;
	background-color: $grayish;
}

.btn {
	-webkit-appearance: none;
	vertical-align: middle;
	border: none;
	padding: 0.75rem 1rem;
	border-radius: 6px;
	transition: background, color, border 250ms ease;
	&-toggle {
		width: 3rem;
		height: 1.75rem;
		background-color: $blue;
		border-radius: 24px;
		position: relative;
		&:hover {
			background-color: $blue-light;
		}
		&__inner {
			width: 1.25rem;
			height: 1.25rem;
			border-radius: 100%;
			background: white;
			position: absolute;
			margin: 4px;
			left: 0;
			top: 0;
			right: 0;
			box-shadow: 0 5px 5px rgba(blue, 0.1);
			transition: left 250ms ease;
			pointer-events: none;
		}
	}
	&-primary {
		background-color: $blue;
		color: #fff;
		border: 2px solid white;
		&:hover {
			background-color: #fff;
			color: $blue;
			border-color: $blue;
		}
	}
	&-secondary {
		background-color: white;
		color: $blue;
		border: 2px solid $blue;
		&:hover {
			background-color: $blue;
			color: white;
			border-color: white;
		}
	}
}

.bg-white {
	background-color: #fff;
}
.bg-blue {
	background-color: $blue;
}

.white {
	color: #fff;
}

.gray-blue {
	color: $gray-blue;
}
.rounded-12 {
	border-radius: 12px;
}

.box-shadow-1 {
	box-shadow: 0 10px 20px rgba(blue, 0.05)
}
.pro {
	height: 50vh;
}
.p-pricing{
	&__cards {
		&__card {
			width: 100%;
			max-width: 16rem;
			transition: all 250ms ease;
		}
	}
}

.js-toggle {
	.btn-toggle__inner {
		left: 1.25rem;
	}
}
!

JS 

              
                (function(w, d) {
	"use strict";

	const id = el => d.getElementById(el);
	const q = el => d.querySelector(el);
	const qa = el => d.querySelectorAll(el);
	const on = (el = null, event, handler, options = {}) => {
		if (el !== null) el.addEventListener(event, handler, options);
	};
	const off = (el = null, event, handler) => {
		if (el !== null) el.removeEventListener(event, handler);
	};

	const $btn = id("js-btn-price");
	const $basic = id("basic");
	const $pro = id("pro");
	const $master = id("master");

	on($btn, "click", e => {
		e.preventDefault();
		let el = e.srcElement;
		el.classList.toggle("js-toggle");
		if (el.classList.contains("js-toggle")) {
			el.setAttribute("aria-describedby", "monthly");
			$basic.textContent = 19.99;
			$pro.textContent = 24.99;
			$master.textContent = 39.99;
		} else {
			el.setAttribute("aria-describedby", "annually");
			$basic.textContent = 19.99 * 12;
			$pro.textContent = 24.99 * 12;
			$master.textContent = 39.99 * 12;
		}
	});
})(window, document);
!
999px

Console