<!-- BEGIN COPY / PASTE -->
    <div class="grid-container">
      <div class="grid-item">Column 1</div>
      <div class="grid-item">Column 2</div>
      <div class="grid-item">Column 3</div>
    </div>

    <style>
      .grid-container {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
      }

      .grid-item {
        background-color: #f0f0f0;
        padding: 20px;
        text-align: center;
      }

      @media (max-width: 768px) {
        .grid-container {
          grid-template-columns: 1fr;
        }
      }
    </style>
    <!-- END COPY / PASTE -->