Advanced CSS Properties and Techniques

CSS Custom Properties (Variables)

Useful for theming and maintaining consistent design values across components.

:root {
  --primary-color: #6c5ce7;
  --border-radius: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.card {
  background-color: var(--primary-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

Variables can be overridden inside media queries or themes:

.dark {
  --primary-color: #1e1e2f;
}

Advanced CSS Grid Layout

Responsive auto-fitting layout:

.container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

Grid template areas for complex layouts:

.layout {
  display: grid;
  grid-template-areas:
    "header header"
    "sidebar main"
    "footer footer";
  grid-template-columns: 250px 1fr;
}

.header { grid-area: header; }
.sidebar { grid-area: sidebar; }
.main { grid-area: main; }
.footer { grid-area: footer; }

Advanced Flexbox Patterns

Equal-height cards with sticky footer:

.card {
  display: flex;
  flex-direction: column;
}

.card-body {
  flex: 1;
}

Perfect centering:

.center {
  display: flex;
  justify-content: center;
  align-items: center;
}

Fluid Typography with clamp()

h1 {
  font-size: clamp(1.5rem, 4vw, 3rem);
}

This sets:

  • Minimum size

  • Fluid scaling

  • Maximum size

Aspect Ratio

.media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

Removes the need for padding hacks.

Object Fit for Media Control

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

Maintains image proportions while filling containers.

Scroll Snap

.slider {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
}

.slide {
  flex: 0 0 100%;
  scroll-snap-align: start;
}

Creates native slider-like behavior.

Advanced Selectors

Attribute selector:

input[type="email"] {
  border: 1px solid #ccc;
}

Pseudo-class selector:

li:nth-child(odd) {
  background-color: #f5f5f5;
}

PHP Card Rendering

Rendering Cards from an Array

<?php
$cards = [
    [
        "title" => "Web Development",
        "desc" => "Learn HTML, CSS, JS",
        "image" => "web.jpg"
    ],
    [
        "title" => "PHP Backend",
        "desc" => "Server-side programming",
        "image" => "php.jpg"
    ]
];
?>

<div class="container">
<?php foreach ($cards as $card): ?>
    <div class="card">
        <img src="<?= $card['image']; ?>" alt="">
        <h3><?= $card['title']; ?></h3>
        <p><?= $card['desc']; ?></p>
    </div>
<?php endforeach; ?>
</div>

Secure Rendering with htmlspecialchars

<?php foreach ($cards as $card): ?>
    <div class="card">
        <img src="<?= htmlspecialchars($card['image']); ?>" alt="">
        <h3><?= htmlspecialchars($card['title']); ?></h3>
        <p><?= htmlspecialchars($card['desc']); ?></p>
    </div>
<?php endforeach; ?>

Prevents XSS by escaping dynamic content.

Rendering Cards from Database Using PDO

<?php
$pdo = new PDO("mysql:host=localhost;dbname=test", "root", "");

$stmt = $pdo->query("SELECT title, description, image FROM courses");

while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    echo "
    <div class='card'>
        <img src='".htmlspecialchars($row['image'])."' alt=''>
        <h3>".htmlspecialchars($row['title'])."</h3>
        <p>".htmlspecialchars($row['description'])."</p>
    </div>
    ";
}
?>

Prepared statement example:

$stmt = $pdo->prepare("SELECT * FROM courses WHERE category = ?");
$stmt->execute([$category]);

Reusable Card Component Function

<?php
function renderCard($title, $desc, $image) {
    $title = htmlspecialchars($title);
    $desc = htmlspecialchars($desc);
    $image = htmlspecialchars($image);

    return "
    <div class='card'>
        <img src='$image' alt=''>
        <h3>$title</h3>
        <p>$desc</p>
    </div>
    ";
}

echo renderCard("Advanced CSS", "Modern layout techniques", "css.jpg");
?>

Output Buffering for Clean Component Templates

<?php
function renderCardComponent($card) {
    ob_start();
    ?>
    <div class="card">
        <img src="<?= htmlspecialchars($card['image']); ?>" alt="">
        <h3><?= htmlspecialchars($card['title']); ?></h3>
        <p><?= htmlspecialchars($card['desc']); ?></p>
    </div>
    <?php
    return ob_get_clean();
}
?>

Separating Logic and View (Simple MVC Pattern)

Controller:

$cards = fetchCourses();
include 'views/cards.php';

View (views/cards.php):

<?php foreach ($cards as $card): ?>
<div class="card">
    <h3><?= htmlspecialchars($card['title']); ?></h3>
</div>
<?php endforeach; ?>