<button>按鈕一</button>
<button>按鈕二</button>
<button>按鈕三</button>
<button>按鈕四</button>

button {
display: block;
}

button {
display: block;
margin-bottom: 10px;
}

<div class="button-container">
<button>按鈕一</button>
<button>按鈕二</button>
<button>按鈕三</button>
<button>按鈕四</button>
</div>
.button-container {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
}
button {
margin-bottom: 10px;
}