如何使按钮中的图标居中

<style>
    .button-container {
        display: flex;
        justify-content: center;
        align-items: center;
    }
</style>

<div class="button-container">
    <button>
        <i class="icon"></i>按钮
    </button>
</div>

<style>
    .button-container {
        position: relative;
    }

    .icon {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
</style>

<div class="button-container">
    <button>
        <i class="icon"></i>按钮
    </button>
</div>