如何在不更改HTML的情况下在同一行上对齐两个元素

<style>
    .left {
        float: left;
    }
    .right {
        float: right;
    }
    .clearfix::after {
        content: "";
        display: table;
        clear: both;
    }
</style>

<div class="clearfix">
    <div class="left">左侧元素</div>
    <div class="right">右侧元素</div>
</div>

<style>
    .container {
        display: flex;
        justify-content: space-between;
    }
</style>

<div class="container">
    <div>左侧元素</div>
    <div>右侧元素</div>
</div>

<style>
    .container {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }
</style>

<div class="container">
    <div>左侧元素</div>
    <div>右侧元素</div>
</div>