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Select element with multiple classes

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Multiple CSS Classes Example</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            background-color: #f0f0f0;
        }
        .card {
            width: 200px;
            padding: 20px;
            border-radius: 10px;
            margin: 10px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        .primary {
            background-color: #e6f3ff;
        }
        .secondary {
            background-color: #fff0e6;
        }
        .highlighted {
            border: 2px solid #ffd700;
        }
        .card.primary.highlighted {
            background-color: #b3d9ff;
        }
        .card.secondary.highlighted {
            background-color: #ffd9b3;
        }
        .title {
            font-weight: bold;
            margin-bottom: 10px;
        }
        .content {
            font-size: 14px;
        }
        .primary .title {
            color: #0066cc;
        }
        .secondary .title {
            color: #cc6600;
        }
    </style>
</head>
<body>
    <div class="card primary">
        <div class="title">Primary Card</div>
        <div class="content">This is a primary card without highlighting.</div>
    </div>
    <div class="card secondary">
        <div class="title">Secondary Card</div>
        <div class="content">This is a secondary card without highlighting.</div>
    </div>
    <div class="card primary highlighted">
        <div class="title">Highlighted Primary</div>
        <div class="content">This is a highlighted primary card.</div>
    </div>
    <div class="card secondary highlighted">
        <div class="title">Highlighted Secondary</div>
        <div class="content">This is a highlighted secondary card.</div>
    </div>
</body>
</html>

You can view it live here.