将按钮与div底部对齐

<style>
    .container {
        display: flex;
        flex-direction: column;
        align-items: flex-end;
    }
</style>

<div class="container">
    <div>这是一个div</div>
    <button>按钮</button>
</div>

<style>
    .container {
        position: relative;
    }

    .button {
        position: absolute;
        bottom: 0;
    }
</style>

<div class="container">
    <div>这是一个div</div>
    <button class="button">按钮</button>
</div>

<style>
    .container {
        display: grid;
        grid-template-rows: auto auto;
    }

    .button {
        align-self: end;
    }
</style>

<div class="container">
    <div>这是一个div</div>
    <button class="button">按钮</button>
</div>