TA貢獻1801條經驗 獲得超8個贊
col-md-offset-3如果您必須添加該類，則必須刪除類并改為 id m-auto。你的表格就變成了寬度的中心。
這是為了您更好地理解的演示片段。
.form_content {
background-color: red;
height: 200px;
width: 100%;
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container-fluid">
<div class="row">
<div class="col-md-4 m-auto">
<div class="form_content"></div>
</div>
</div>
</div>
</body>
</html>
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