Code Playground

<main class="main flow">
  <h1 class="main__heading">Pricing</h1>
  <div class="main__cards cards">
    <div class="cards__inner">
      <div class="cards__card card">
        <h2 class="card__heading">Basic</h2>
        <p class="card__price">$9.99</p>
        <ul role="list" class="card__bullets flow">
          <li>Access to standard workouts and nutrition plans</li>
          <li>Email support</li>
        </ul>
        <a href="#basic" class="card__cta cta">Get Started</a>
      </div>

<div class="cards__card card">
        <h2 class="card__heading">Pro</h2>
        <p class="card__price">$19.99</p>
        <ul role="list" class="card__bullets flow">
          <li>Access to advanced workouts and nutrition plans</li>
          <li>Priority Email support</li>
          <li>Exclusive access to live Q&A sessions</li>
        </ul>
        <a href="#pro" class="card__cta cta">Upgrade to Pro</a>
      </div>

<div class="cards__card card">
        <h2 class="card__heading">Ultimate</h2>
        <p class="card__price">$29.99</p>
        <ul role="list" class="card__bullets flow">
          <li>Access to all premium workouts and nutrition plans</li>
          <li>24/7 Priority support</li>
          <li>1-on-1 virtual coaching session every month</li>
          <li>Exclusive content and early access to new features</li>
        </ul>
        <a href="#ultimate" class="card__cta cta">Go Ultimate</a>
      </div>
    </div>
    
    <div class="overlay cards__inner"></div>
  </div>
</main>

@import url("https://fonts.googleapis.com/css2?family=League+Spartan:wght@400;500;600;700;800;900&display=swap");

*,
*::after,
*::before {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  min-height: 100vh;
}

body {
  display: grid;
  place-items: center;
  font-family: "League Spartan", system-ui, sans-serif;
  font-size: 1.1rem;
  line-height: 1.2;
  background-color: #212121;
  color: #ddd;
}

ul {
  list-style: none;
}

.main {
  max-width: 75rem;
  padding: 3em 1.5em;
}

.main__heading {
  font-weight: 600;
  font-size: 2.25em;
  margin-bottom: 0.75em;
  text-align: center;
  color: #eceff1;
}

.cards {
  position: relative;
}

.cards__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5em;
}

.card {
  --flow-space: 0.5em;
  --hsl: var(--hue), var(--saturation), var(--lightness);
  flex: 1 1 14rem;
  padding: 1.5em 2em;
  display: grid;
  grid-template-rows: auto auto auto 1fr;
  align-items: start;
  gap: 1.25em;
  color: #eceff1;
  background-color: #2b2b2b;
  border: 1px solid #eceff133;
  border-radius: 15px;
}

.card:nth-child(1) {
  --hue: 165;
  --saturation: 82.26%;
  --lightness: 51.37%;
}

.card:nth-child(2) {
  --hue: 291.34;
  --saturation: 95.9%;
  --lightness: 61.76%;
}

.card:nth-child(3) {
  --hue: 338.69;
  --saturation: 100%;
  --lightness: 48.04%;
}

.card__bullets {
  line-height: 1.4;
}

.card__bullets li::before {
  display: inline-block;
  content: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512' width='16' title='check' fill='%23dddddd'%3E%3Cpath d='M173.898 439.404l-166.4-166.4c-9.997-9.997-9.997-26.206 0-36.204l36.203-36.204c9.997-9.998 26.207-9.998 36.204 0L192 312.69 432.095 72.596c9.997-9.997 26.207-9.997 36.204 0l36.203 36.204c9.997 9.997 9.997 26.206 0 36.204l-294.4 294.401c-9.998 9.997-26.207 9.997-36.204-.001z' /%3E%3C/svg%3E");
  transform: translatey(0.25ch);
  margin-right: 1ch;
}

.card__heading {
  font-size: 1.05em;
  font-weight: 600;
}

.card__price {
  font-size: 1.75em;
  font-weight: 700;
}

.flow > * + * {
  margin-top: var(--flow-space, 1.25em);
}

.cta {
  display: block;
  align-self: end;
  margin: 1em 0 0.5em 0;
  text-align: center;
  text-decoration: none;
  color: #fff;
  background-color: #0d0d0d;
  padding: 0.7em;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
}

.overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  user-select: none;
  opacity: var(--opacity, 0);
  -webkit-mask: radial-gradient(
    25rem 25rem at var(--x) var(--y),
    #000 1%,
    transparent 50%
  );
  mask: radial-gradient(
    25rem 25rem at var(--x) var(--y),
    #000 1%,
    transparent 50%
  );
  transition: 400ms mask ease;
  will-change: mask;
}

.overlay .card {
  background-color: hsla(var(--hsl), 0.15);
  border-color: hsla(var(--hsl), 1);
  box-shadow: 0 0 0 1px inset hsl(var(--hsl));
}

.overlay .cta {
  display: block;
  grid-row: -1;
  width: 100%;
  background-color: hsl(var(--hsl));
  box-shadow: 0 0 0 1px hsl(var(--hsl));
}

:not(.overlay) > .card {
  transition: 400ms background ease;
  will-change: background;
}

:not(.overlay) > .card:hover {
  --lightness: 95%;
  background: hsla(var(--hsl), 0.1);
}

console.clear();

const cardsContainer = document.querySelector(".cards");
const cardsContainerInner = document.querySelector(".cards__inner");
const cards = Array.from(document.querySelectorAll(".card"));
const overlay = document.querySelector(".overlay");

const applyOverlayMask = (e) => {
  const overlayEl = e.currentTarget;
  const x = e.pageX - cardsContainer.offsetLeft;
  const y = e.pageY - cardsContainer.offsetTop;

overlayEl.style = `--opacity: 1; --x: ${x}px; --y:${y}px;`;
};

const createOverlayCta = (overlayCard, ctaEl) => {
  const overlayCta = document.createElement("div");
  overlayCta.classList.add("cta");
  overlayCta.textContent = ctaEl.textContent;
  overlayCta.setAttribute("aria-hidden", true);
  overlayCard.append(overlayCta);
};

const observer = new ResizeObserver((entries) => {
  entries.forEach((entry) => {
    const cardIndex = cards.indexOf(entry.target);
    let width = entry.borderBoxSize[0].inlineSize;
    let height = entry.borderBoxSize[0].blockSize;

if (cardIndex >= 0) {
      overlay.children[cardIndex].style.width = `${width}px`;
      overlay.children[cardIndex].style.height = `${height}px`;
    }
  });
});

const initOverlayCard = (cardEl) => {
  const overlayCard = document.createElement("div");
  overlayCard.classList.add("card");
  createOverlayCta(overlayCard, cardEl.lastElementChild);
  overlay.append(overlayCard);
  observer.observe(cardEl);
};

cards.forEach(initOverlayCard);
document.body.addEventListener("pointermove", applyOverlayMask);

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