使用现代 CSS 构建响应式等高卡片（Flexbox 的魔力和无媒体查询）

<main class="card-container">
<!--   First card -->
  <article class="card">
    <img src="https://placehold.co/320x240" width="320" height="240" alt="Replace placeholder image here" class="card-image" loading="lazy">
    <h2 class="card-title">Title one</h2>
    <p class="card-description">Lorem ipsum dolor sit amet consectetur, adipisicing elit. Quod, aliquid ex vel labore fugit dignissimos libero eos hic, fuga, vitae consequuntur quidem.</p>
    <button class="card-button" aria-label="Read more about Title one">Read More</button>
  </article>
  <!--   Second card -->
  <article class="card">
    <img src="https://placehold.co/320x240" width="320" height="240"  alt="Replace placeholder image here" class="card-image" loading="lazy">
    <h2 class="card-title">Title two</h2>
    <p class="card-description">Lorem, ipsum dolor sit amet consectetur adipisicing elit. Magnam aperiam consequuntur, saepe at repellat nobis.</p>
    <button class="card-button" aria-label="Read more about Title two">Read More</button>
  </article>
  <!--   Third card -->
  <article class="card">
    <img src="https://placehold.co/320x240" width="320" height="240"  alt="Replace placeholder image here" class="card-image" loading="lazy">
    <h2 class="card-title">Title three</h2>
    <p class="card-description">Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolorum reprehenderit at cumque? Architecto numquam nam placeat suscipit!</p>
    <button class="card-button" aria-label="Read more about Title three">Read More</button>
  </article>
</main>

/* Basic CSS Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Ensure that our layout is centred horizontally and vertically on the page */
body {
    display: flex; /* using CSS flexbox to vertically and horizontally centre all cards */
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow-x: hidden; /* Prevent horizontal scrolling */
}

/* Cards */
.card-container {
    display: flex; /* using CSS flexbox to display each card at the centre */
    justify-content: center;
    align-items: stretch; /* use stretch for equal height of all cards */
    gap: 1.5625rem; /* add space between each card */
    flex-wrap: wrap;
    padding: 1rem; 
    max-width: 100%; /* Prevent container from exceeding viewport width */
}

.card {
    display: flex;
    flex-direction: column;
    width: 20rem;
    background-color: #fff;
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.4);
    text-align: center;
    text-wrap: balance; /* ensures content is evenly distributed across multiple lines for better readability. */
    overflow: hidden;
}

.card-image {
    width: 100%;
    height: auto;
    object-fit: cover;
    margin-bottom: 0.85rem;
}

.card-title {
    font-size: 1.25rem;
    padding: 1rem;
    color: #3ca69f;
}

.card-description {
    flex-grow: 1; /* allow the content to take available space, thus maintaining equal height no matter the length of the content */
    padding: 0 1rem 1rem;
    font-size: 0.975rem;
    line-height: 1.5;
}

/* Cards button */
.card-button {
    align-self: center; /* placing the button at the center */
    margin: 1rem 0 3rem;
    padding: 0.625rem 1rem;
    font-size: 1rem;
    color: #ffffff;
    background-color: #3ca69f;
    border: none;
    border-radius: 0.3125rem;
    cursor: pointer;
}

.card {
    transition: 0.5s ease all;
}

.card-button {
    transition: 0.5s ease all;
}

/* cards hover effect */
.card:hover {
    background-color: #276662;
    color: #ffffff;
}

.card:hover > .card-button {
    background-color: #ffffff;
    color: #276662;
    font-weight: 700;
}

.card:hover > .card-title {
    color: #ffffff;
}

/* Declare variables */
:root {
    --primary-color: #3ca69f;
    --secondary-color: #276662;
    --text-color: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --border-radius: 0.3125rem;
    --spacing: 1rem;
    --transition-duration: 0.5s;
}