如何让网页在色彩盒中打开？

<div id="color-box" style="width: 300px; height: 200px; background-color: #FF0000;"></div>

<script>
    document.addEventListener("DOMContentLoaded", function() {
        var colorBox = document.getElementById("color-box");
        colorBox.innerHTML = "<h1>网页内容</h1><p>这是一个在色彩盒中打开的网页。</p>";
    });
</script>

<style>
    #color-box {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        color: #FFFFFF;
        padding: 20px;
    }
    
    h1 {
        font-size: 24px;
        margin-bottom: 10px;
    }
    
    p {
        font-size: 16px;
    }
</style>