SOURCE

    // 在页面加载完成后触发打印操作
    window.onload = function() {
      // 打开打印对话框
      window.print();
    };

<section>
	<main></main>
	<main></main>
	<main></main>
	<main></main>
	<main></main>
</section>

section {
    height: 100vh;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    background-color: green;
    justify-content: space-between;
    align-content: flex-start;
    align-items: flex-start;
}

main {
    height: 5.74rem;
    width: 49%;
    background-color:orange;
}