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<!DOCTYPE html> <html> <head> <style> .grid-container { display: grid; grid-template-columns: auto auto auto; gap: 10px; background-color: #2196F3; padding: 10px; } .grid-container > div { background-color: rgba(255, 255, 255, 0.8); text-align: center; padding: 20px 0; font-size: 30px; } .item1 { grid-column-start: 1; grid-column-end: 3; } </style> </head> <body> <h1>Grid Lines</h1> <div class="grid-container"> <div class="item1">1</div> <div class="item2">2</div> <div class="item3">3</div> <div class="item4">4</div> <div class="item5">5</div> <div class="item6">6</div> <div class="item7">7</div> <div class="item8">8</div> </div> <p>You can refer to line numbers when placing grid items.</p> </body> </html>