Twitter bootstrap v3 - 输入旁边的按钮未四舍五入

Question

我复制了这段代码（来自official documentation）并对其进行了修改：

<div class="row">
    <div class="col-xs-6 col-xs-offset-3">
        <div class="form-group">
            <div class="input-group">
                <input type="text" class="form-control" placeholder="Email addresses">
                <span class="input-group-btn">
                    <button class="btn btn-primary" type="button">
                        <i class="fa fa-envelope-o" aria-hidden="true"></i>
                        Send
                    </button>
                </span>
            </div>
        </div>
    </div>
</div>

按钮的右侧未在源中进行舍入。结果：

我缺少什么？

Answer 1

@ No1Lives4Ever你的代码工作正常。请参阅以下代码段...

＆＃13;

＆＃13;

<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<div class="row">
    <div class="col-xs-6 col-xs-offset-3">
        <div class="form-group">
            <div class="input-group">
                <input type="text" class="form-control" placeholder="Email addresses">
                <span class="input-group-btn">
                    <button class="btn btn-primary" type="button">
                        <i class="fa fa-envelope-o" aria-hidden="true"></i>
                        Send
                    </button>
                </span>
            </div>
        </div>
    </div>
</div>

＆＃13;

＆＃13;

＆＃13;