style.css
    body {
            background: #121212;
            color: white;
            font-family: sans-serif;
            padding: 2rem;
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1rem;
        }

        .box {
            background: #2e2e3e;
            padding: 1rem;
            border-radius: 10px;
            text-align: center;
        }
    

    
index.html
    <div class="grid">
        <div class="box">1</div>
        <div class="box">2</div>
        <div class="box">3</div>
    </div>