如何在按钮内居中对齐图标？

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

<div class="button-container">
    <button>
        <img src="icon.png" alt="图标">
    </button>
</div>

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

<div class="button-container">
    <button>
        <img src="icon.png" alt="图标">
    </button>
</div>

<style>
    .button-container {
        text-align: center;
    }
    
    .button-container img {
        display: inline-block;
    }
</style>

<div class="button-container">
    <button>
        <img src="icon.png" alt="图标">
    </button>
</div>