<!DOCTYPE html>
<html>
<head>
    <style>
        .grid-container {
            display: grid;
            grid-template-columns: auto auto auto;
            gap: 10px;
            background-color: lightgray;
            padding: 20px;
        }
        .grid-item {
            background-color: white;
            padding: 20px;
            text-align: center;
            border: 1px solid #ccc;
        }
    </style>
</head>
<body>
    <div class="grid-container">
        <div class="grid-item">Item 1</div>
        <div class="grid-item">Item 2</div>
        <div class="grid-item">Item 3</div>
        <div class="grid-item">Item 4</div>
        <div class="grid-item">Item 5</div>
        <div class="grid-item">Item 6</div>
    </div>
</body>
</html>
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