<div class="grid-container">
  <div>1</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
  <div>6</div>
  <div>7</div>
  <div>8</div>
  <div>9</div>
  <div>10</div>
  <div>11</div>
  <div>12</div>
</div>

.grid-container {
    display: grid;
    gap: 20px;
    grid-template-columns: 1fr 1fr;
    grid-auto-rows: 1fr;
    padding: 10px;
    background-color: aqua;
    max-width: 80%;
    margin: auto;
}

@media (min-width: 700px) {
  .grid-container {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (min-width: 1000px) {
  .grid-container {
    grid-template-columns: repeat(4, 1fr);
  }
}

.grid-container div {
    background-color: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.8);
    padding: 20px;
    font-size: 30px;
    text-align: center;
    aspect-ratio: 1;
}